Merge branch 'jt/doc-use-octal-with-printf' into next

Suggest to refrain from using hex literals that are non-portable
when writing printf(1) format strings.

* jt/doc-use-octal-with-printf:
  CodingGuidelines: use octal escapes, not hex

Documentation/CodingGuidelines

@@ -188,6 +188,10 @@ For shell scripts specifically (not exhaustive):
    hopefully nobody starts using "local" before they are reimplemented
    in C ;-)
 
+ - Use octal escape sequences (e.g. "\302\242"), not hexadecimal (e.g.
+   "\xc2\xa2") in printf format strings, since hexadecimal escape
+   sequences are not portable.
+
 
 For C programs: