Rename inputs and outputs to use file paths

Updated input and output parameter names to reflect file paths for issues and fixings.

Author: lindseywild

.github/actions/fix/README.md

@@ -6,9 +6,9 @@ Attempts to fix issues with Copilot.
 
 ### Inputs
 
-#### `issues`
+#### `issues_file`
 
-**Required** List of issues to attempt to fix—including, at a minimum, their `url`s—as stringified JSON. For example: `'[{"url":"https://github.com/github/docs/issues/123"},{"nodeId":"SXNzdWU6Mg==","url":"https://github.com/github/docs/issues/124"},{"id":4,"nodeId":"SXNzdWU6NA==","url":"https://github.com/github/docs/issues/126","title":"Accessibility issue: 4"}]'`.
+**Required** Path to a JSON file containing the list of issues to attempt to fix—including, at a minimum, their `url`s. For example: `'[{"url":"https://github.com/github/docs/issues/123"},{"nodeId":"SXNzdWU6Mg==","url":"https://github.com/github/docs/issues/124"},{"id":4,"nodeId":"SXNzdWU6NA==","url":"https://github.com/github/docs/issues/126","title":"Accessibility issue: 4"}]'`.
 
 #### `repository`
 
@@ -20,6 +20,6 @@ Attempts to fix issues with Copilot.
 
 ### Outputs
 
-#### `fixings`
+#### `fixings_file`
 
-List of pull requests filed (and their associated issues), as stringified JSON. For example: `'[{"issue":{"id":1,"nodeId":"SXNzdWU6MQ==","url":"https://github.com/github/docs/issues/123","title":"Accessibility issue: 1"},"pullRequest":{"url":"https://github.com/github/docs/pulls/124"}}]'`
+Path to a JSON file containing the list of pull requests filed (and their associated issues). For example: `'[{"issue":{"id":1,"nodeId":"SXNzdWU6MQ==","url":"https://github.com/github/docs/issues/123","title":"Accessibility issue: 1"},"pullRequest":{"url":"https://github.com/github/docs/pulls/124"}}]'`