docs: update

sowm.c

@@ -146,7 +146,7 @@ Window win_current() {
 void win_add(Window w) {
     client *c, *t;
 
-    if (!(c = (client *)calloc(1,sizeof(client))))
+    if (!(c = (client *)calloc(1, sizeof(client))))
         exit(1);
 
     if (!list) {