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/pxe_utils.h b/include/pxe_utils.h
index b7037f8..dad2668 100644
--- a/include/pxe_utils.h
+++ b/include/pxe_utils.h
@@ -205,7 +205,7 @@
  * @allow_abs_path: true to allow absolute paths
  * @bootfile: Bootfile whose directory loaded files are relative to, NULL if
  *	none
- * @return 0 if OK, -ENOMEM if out of memory, -E2BIG if bootfile is larger than
+ * Return: 0 if OK, -ENOMEM if out of memory, -E2BIG if bootfile is larger than
  *	MAX_TFTP_PATH_LEN bytes
  */
 int pxe_setup_ctx(struct pxe_context *ctx, struct cmd_tbl *cmdtp,
@@ -232,7 +232,7 @@
  * pxe_get_file_size() - Read the value of the 'filesize' environment variable
  *
  * @sizep: Place to put the value
- * @return 0 if OK, -ENOENT if no such variable, -EINVAL if format is invalid
+ * Return: 0 if OK, -ENOENT if no such variable, -EINVAL if format is invalid
  */
 int pxe_get_file_size(ulong *sizep);