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/search.h b/include/search.h
index d0bb443..7faf23f 100644
--- a/include/search.h
+++ b/include/search.h
@@ -86,7 +86,7 @@
  * @key: Name of entry to delete
  * @htab: Hash table
  * @flag: Flags to use (H_...)
- * @return 0 on success, -ENOENT if not found, -EPERM if the hash table callback
+ * Return: 0 on success, -ENOENT if not found, -EPERM if the hash table callback
  *	rejected changing the variable, -EINVAL if the hash table refused to
  *	delete the variable
  */