ResultAction.py: Fix docstring typo
ResultAction.py: Fix docstring typo

This fixes the typo and changes
it from :result --> :result:

Fixes https://github.com/coala/coala/issues/5223

coala/coala,coala-analyzer/coala,SanketDG/coala,coala/coala,jayvdb/coala,coala-analyzer/coala,SanketDG/coala,coala-analyzer/coala,jayvdb/coala,SanketDG/coala,jayvdb/coala,coala/coala