feat(patterns): improve error messaging and clean up help-table comments

patterns.md

@@ -36,7 +36,10 @@ Check the first param and exit if it is empty.
 
 ```bash
 deploy() {
-    if [[ -z "$1" ]]; then echo "\$1 is empty."; exit; fi
+    if [[ -z "$1" ]]; then
+        echo '$1/path is empty.'
+        exit
+    fi
 ```
 
 ## Prompt for input