fix the start of the code block in committers-guide

[vladlen]

Summary

The current version of the articles/committers-guide has the code block without starting boundary (....). It simply located after the text "(the rest of ls.c has been omitted):"
As result the finishing boundary of this code block is considered as start of the code block for the next text paragraph. The consequences:

1. The document is rendered to HTML with errors (the text is shown in the code block)
2. All text fragments after this place are imported into the Weblate with wrong types: code blocks are imported as plain text type, and text paragraphs are imported as code block fragments. It creates troubles for translating and generating of correct documents for this article in national languages.

Proposed patch fixes this error in original document,

[bcr]

documentation/content/en/articles/committers-guide/_index.adoc

837

Don't you need to preserve the "new sentence on new line" here?

[carlavilla]

documentation/content/en/articles/committers-guide/_index.adoc

837

I'll fix directly in the commit

[bcr]

Alright, nothing to complain about.