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/common/fdt_support.c b/common/fdt_support.c
index c6b93e7..efbd900 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -2049,7 +2049,7 @@
  * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
  *
  * @blobp: Pointer to FDT pointer
- * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
+ * Return: 1 if OK, 0 if bad (in which case *blobp is set to NULL)
  */
 int fdt_valid(struct fdt_header **blobp)
 {