doc: replace @return by Return:

Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/linux/string.h b/include/linux/string.h
index 3169c93..df1c1c5 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -62,7 +62,7 @@
  * NULL
  * @s: string to search
  * @c: character to search for
- * @return position of @c in @s, or end of @s if not found
+ * Return: position of @c in @s, or end of @s if not found
  */
 const char *strchrnul(const char *s, int c);
 
@@ -89,7 +89,7 @@
  *
  * @s: string to search
  * @reject: strings which cause the search to halt
- * @return number of characters at the start of @s which are not in @reject
+ * Return: number of characters at the start of @s which are not in @reject
  */
 size_t strcspn(const char *s, const char *reject);
 #endif
@@ -136,7 +136,7 @@
  *
  * @src: data to copy in
  * @len: number of bytes to copy
- * @return allocated buffer with the copied contents, or NULL if not enough
+ * Return: allocated buffer with the copied contents, or NULL if not enough
  *	memory is available
  *
  */