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/u-boot/rsa.h b/include/u-boot/rsa.h
index 7556aa5..2ed2ac7 100644
--- a/include/u-boot/rsa.h
+++ b/include/u-boot/rsa.h
@@ -75,7 +75,7 @@
  * @hash:	Hash according to algorithm specified in @info
  * @sig:	Signature
  * @sig_len:	Number of bytes in signature
- * @return 0 if verified, -ve on error
+ * Return: 0 if verified, -ve on error
  */
 int rsa_verify_hash(struct image_sign_info *info,
 		    const uint8_t *hash, uint8_t *sig, uint sig_len);
@@ -90,7 +90,7 @@
  * @data_len:	Data length
  * @sig:	Signature
  * @sig_len:	Number of bytes in signature
- * @return 0 if verified, -ve on error
+ * Return: 0 if verified, -ve on error
  */
 int rsa_verify(struct image_sign_info *info,
 	       const struct image_region region[], int region_count,