Development Documentation: follow recommendation to avoid Latin abbreviations

doc/development/documentation/styleguide.md

@@ -816,7 +816,7 @@ you have your MR reviewed and approved by a technical writer.
 
 1. Copy the code below and paste it into your Markdown file.
    Leave a blank line above and below it. Do NOT edit the code
-   (don't remove or add any spaces, etc).
+   (don't remove or add any spaces).
 1. On YouTube, visit the video URL you want to display. Copy
    the regular URL from your browser (`https://www.youtube.com/watch?v=VIDEO-ID`)
    and replace the video title and link in the line under `<div class="video-fallback">`.
@@ -1000,7 +1000,7 @@ Whenever you need to call special attention to particular sentences,
 use the following markup for highlighting.
 
 _Note that the alert boxes only work for one paragraph only. Multiple paragraphs,
-lists, headers, etc will not render correctly. For multiple lines, use blockquotes instead._
+lists, headers and so on, will not render correctly. For multiple lines, use blockquotes instead._
 
 Alert boxes only render on the GitLab Docs site (<https://docs.gitlab.com>).
 Within GitLab itself, they will appear as plain Markdown text (like the examples