Updated SC2113 (markdown)

SC2113.md

@@ -2,30 +2,31 @@
 
 ### Problematic code:
 
-In `sh`,
-
 ```sh
-function quit {
-    exit
+#!/bin/sh
+function hello {
+    echo "Hello World"
 }
 ```
 
 ### Correct code:
 
-1. add `()` to after the function name. _this code newly cause [[SC2113]]._
-
 ```sh
-function quit() {
-    exit
+#!/bin/sh
+hello() {
+    echo "Hello World"
 }
-#=> SC2112: 'function' keyword is non-standard. Delete it.
-```
 
-2. remove `function`
+### Rationale:
 
-```sh
-quit() {
-    exit
-}
-#=> No issues detected!
-```
+`function` is a non-standard keyword that can be used to declare functions in Bash and Ksh.
+
+In POSIX `sh` and `dash`, a function is defined without a `function` keyword. Instead, the function name is followed by `()` as in the correct example.
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!