CachingUtilities: Use single quotes for strings
CachingUtilities: Use single quotes for strings

Using single quotes for strings in docstring
examples.

Closes https://github.com/coala/coala/issues/4674

jayvdb/coala,Asalle/coala,coala-analyzer/coala,nemaniarjun/coala,aptrishu/coala,Asalle/coala,karansingh1559/coala,shreyans800755/coala,Nosferatul/coala,SanketDG/coala,rimacone/testing2,kartikeys98/coala,coala/coala,kartikeys98/coala,karansingh1559/coala,CruiseDevice/coala,Nosferatul/coala,aptrishu/coala,Nosferatul/coala,SanketDG/coala,CruiseDevice/coala,coala/coala,jayvdb/coala,coala/coala,karansingh1559/coala,Asalle/coala,CruiseDevice/coala,rimacone/testing2,shreyans800755/coala,nemaniarjun/coala,coala-analyzer/coala,shreyans800755/coala,coala-analyzer/coala,aptrishu/coala,SanketDG/coala,kartikeys98/coala,rimacone/testing2,nemaniarjun/coala,jayvdb/coala