git credential manager: update links

The Git Fundamentals team has migrated the Git Credential Manager tool to
its own org:

https://github.com/GitCredentialManager

The team has also updated the name from Git Credential Manager Core to Git
Credential Manager. Updating links that currently point to the Microsoft
org and old name according to this change.

Author: ldennington

content/get-started/getting-started-with-git/caching-your-github-credentials-in-git.md

@@ -35,7 +35,7 @@ For more information about authenticating with {% data variables.product.prodnam
 
 ## Git Credential Manager Core
 
-[Git Credential Manager Core](https://github.com/microsoft/Git-Credential-Manager-Core) (GCM Core) is another way to store your credentials securely and connect to GitHub over HTTPS. With GCM Core, you don't have to manually [create and store a PAT](/github/authenticating-to-github/creating-a-personal-access-token), as GCM Core manages authentication on your behalf, including 2FA (two-factor authentication).
+[Git Credential Manager Core](https://github.com/GitCredentialManager/git-credential-manager) (GCM Core) is another way to store your credentials securely and connect to GitHub over HTTPS. With GCM Core, you don't have to manually [create and store a PAT](/github/authenticating-to-github/creating-a-personal-access-token), as GCM Core manages authentication on your behalf, including 2FA (two-factor authentication).
 
 {% mac %}
 
@@ -89,7 +89,7 @@ For Linux, install Git and GCM Core, then configure Git to use GCM Core.
 
 1. Install Git from your distro's packaging system. Instructions will vary depending on the flavor of Linux you run.
 
-2. Install GCM Core. See the [instructions in the GCM Core repo](https://github.com/microsoft/Git-Credential-Manager-Core#linux-install-instructions), as they'll vary depending on the flavor of Linux you run.
+2. Install GCM Core. See the [instructions in the GCM Core repo](https://github.com/GitCredentialManager/git-credential-manager#linux-install-instructions), as they'll vary depending on the flavor of Linux you run.
 
 3. Configure Git to use GCM Core. There are several backing stores that you may choose from, so see the GCM Core docs to complete your setup. For more information, see "[GCM Core Linux](https://aka.ms/gcmcore-linuxcredstores)."
 
@@ -103,4 +103,4 @@ For more options for storing your credentials on Linux, see [Credential Storage]
 
 <br>
 
-For more information or to report issues with GCM Core, see the official GCM Core docs at "[Git Credential Manager Core](https://github.com/microsoft/Git-Credential-Manager-Core)."
+For more information or to report issues with GCM Core, see the official GCM Core docs at "[Git Credential Manager Core](https://github.com/GitCredentialManager/git-credential-manager)."

data/release-notes/enterprise-server/3-2/0-rc1.yml

@@ -61,7 +61,7 @@ sections:
         - |
           Git Credential Manager (GCM) Core versions 2.0.452 and later now provide security-hardened credential storage and multi-factor authentication support for {% data variables.product.product_name %}.
 
-          GCM Core with support for {% data variables.product.product_name %} is included with [Git for Windows](https://gitforwindows.org) versions 2.32 and later. GCM Core is not included with Git for macOS or Linux, but can be installed separately. For more information, see the [latest release](https://github.com/microsoft/Git-Credential-Manager-Core/releases/) and [installation instructions](https://github.com/microsoft/Git-Credential-Manager-Core/releases/) in the `microsoft/Git-Credential-Manager-Core` repository.
+          GCM Core with support for {% data variables.product.product_name %} is included with [Git for Windows](https://gitforwindows.org) versions 2.32 and later. GCM Core is not included with Git for macOS or Linux, but can be installed separately. For more information, see the [latest release](https://github.com/GitCredentialManager/git-credential-manager/releases/) and [installation instructions](https://github.com/GitCredentialManager/git-credential-manager/releases/) in the `GitCredentialManager/git-credential-manager` repository.
 
   changes:
     - heading: Administration Changes

data/release-notes/enterprise-server/3-2/0.yml

@@ -59,7 +59,7 @@ sections:
         - |
           Git Credential Manager (GCM) Core versions 2.0.452 and later now provide security-hardened credential storage and multi-factor authentication support for {% data variables.product.product_name %}.
 
-          GCM Core with support for {% data variables.product.product_name %} is included with [Git for Windows](https://gitforwindows.org) versions 2.32 and later. GCM Core is not included with Git for macOS or Linux, but can be installed separately. For more information, see the [latest release](https://github.com/microsoft/Git-Credential-Manager-Core/releases/) and [installation instructions](https://github.com/microsoft/Git-Credential-Manager-Core/releases/) in the `microsoft/Git-Credential-Manager-Core` repository.
+          GCM Core with support for {% data variables.product.product_name %} is included with [Git for Windows](https://gitforwindows.org) versions 2.32 and later. GCM Core is not included with Git for macOS or Linux, but can be installed separately. For more information, see the [latest release](https://github.com/GitCredentialManager/git-credential-manager/releases/) and [installation instructions](https://github.com/GitCredentialManager/git-credential-manager/releases/) in the `GitCredentialManager/git-credential-manager` repository.
 
   changes:
     - heading: Administration Changes