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/drivers/net/octeontx2/nix_af.c b/drivers/net/octeontx2/nix_af.c
index d513917..cd098d6 100644
--- a/drivers/net/octeontx2/nix_af.c
+++ b/drivers/net/octeontx2/nix_af.c
@@ -336,7 +336,7 @@
  *
  * @param nix     Handle to setup
  *
- * @return 0, or negative on failure
+ * Return: 0, or negative on failure
  */
 static int nix_af_setup_sq(struct nix *nix)
 {
@@ -445,7 +445,7 @@
  * @param cindex Context index
  * @param resp   Result pointer
  *
- * @return	0 for success, -EBUSY on failure
+ * Return:	0 for success, -EBUSY on failure
  */
 static int nix_aq_issue_command(struct nix_af *nix_af,
 				int lf,