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/arch/x86/cpu/broadwell/refcode.c b/arch/x86/cpu/broadwell/refcode.c
index 6c04dde..aced3e5 100644
--- a/arch/x86/cpu/broadwell/refcode.c
+++ b/arch/x86/cpu/broadwell/refcode.c
@@ -65,7 +65,7 @@
  * platform controller hub (PCH). This function should be implemented by the
  * CPU-specific code.
  *
- * @return 0 on success, -ve on failure
+ * Return: 0 on success, -ve on failure
  */
 static int cpu_run_reference_code(void)
 {