doc-guide: kernel-doc: document Returns: spelling

scripts/kernel-doc accepts "Return:" or "Returns:" for describing the
return value of a function or function-like macro, so document this
alternative spelling and use it in an example.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240522224726.10498-1-rdunlap@infradead.org

Documentation/doc-guide/kernel-doc.rst

@@ -143,7 +143,7 @@ Return values
 ~~~~~~~~~~~~~
 
 The return value, if any, should be described in a dedicated section
-named ``Return``.
+named ``Return`` (or ``Returns``).
 
 .. note::
 
@@ -337,7 +337,7 @@ Typedefs with function prototypes can also be documented::
    * Description of the type.
    *
    * Context: Locking context.
-   * Return: Meaning of the return value.
+   * Returns: Meaning of the return value.
    */
    typedef void (*type_name)(struct v4l2_ctrl *arg1, void *arg2);