Merge branch 'jc/allow-strlen-substitution-in-shell-scripts'

Coding guideline update.

* jc/allow-strlen-substitution-in-shell-scripts:
  CodingGuidelines: allow ${#posix} == strlen($posix)

Author: gitster

Documentation/CodingGuidelines

@@ -91,8 +91,6 @@ For shell scripts specifically (not exhaustive):
 
    - No shell arrays.
 
-   - No strlen ${#parameter}.
-
    - No pattern replacement ${parameter/pattern/string}.
 
  - We use Arithmetic Expansion $(( ... )).