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/trace.h b/include/trace.h
index 606dba9..e7aee02 100644
--- a/include/trace.h
+++ b/include/trace.h
@@ -55,7 +55,7 @@
  * @param buff		Buffer in which to place data, or NULL to count size
  * @param buff_size	Size of buffer
  * @param needed	Returns number of bytes used / needed
- * @return 0 if ok, -1 on error (buffer exhausted)
+ * Return: 0 if ok, -1 on error (buffer exhausted)
  */
 int trace_list_functions(void *buff, size_t buff_size, size_t *needed);