[3.14] Docs: Remove unnecessary trailing backslashes (GH-135781) (GH-135791)

Docs: Remove unnecessary trailing backslashes (GH-135781)

This fixes Sphinx's gettext extraction for translations.
(cherry picked from commit 6a16b3c)

Co-authored-by: Rafael Fontenelle <rffontenelle@users.noreply.github.com>

Author: miss-islington

Doc/c-api/extension-modules.rst

@@ -242,6 +242,6 @@ in the following ways:
 * Single-phase modules support module lookup functions like
   :c:func:`PyState_FindModule`.
 
-.. [#testsinglephase] ``_testsinglephase`` is an internal module used \
-   in CPython's self-test suite; your installation may or may not \
+.. [#testsinglephase] ``_testsinglephase`` is an internal module used
+   in CPython's self-test suite; your installation may or may not
    include it.