Updated SC2155 (markdown)

SC2155.md

@@ -66,15 +66,19 @@ foo="$(mycmd)"
 readonly foo
 ```
 
-#### Word splitting and quoting issue with dash, maybe others
+## Word splitting and quoting issue with dash, maybe others
 
 A serious quoting problem with dash is another reason to declare and assign separately. Dash is the [default, `/bin/sh` shell on Ubuntu](https://wiki.ubuntu.com/DashAsBinSh). More specifically, dash version 0.5.8-2.10 and others cannot run this code:
 ```sh
-VAR1='white spa/ce'
-local var2=$(printf '%s' "${VAR1}")
+f(){ local e=$1; }
+g(){ local g=$(printf '%s' "foo 2"); }
+f "1 2"
+g
 ``` 
 While this runs fine in other shells, [dash doesn't treat this as an assignment](http://mywiki.wooledge.org/BashPitfalls#local_var.3D.24.28cmd.29) and fails like this:
 ```
-local: spa/ce: bad variable name
+local: 2: bad variable name
 ```
-After separating this runs fine in any shell. If you really don't want to separate it, you can double quote the substitutions.
+The direct workaround to this bug is to quote the right-hand-side of the assignment. Separating declaraction and assignment also makes this runs fine in any shell.
+
+(A rule to catch this problem is in the works at [#1556](https://github.com/koalaman/shellcheck/issues/1556)).