I removed an extra space and I improved wording

doc/development/documentation/index.md

@@ -168,10 +168,9 @@ Things to note:
   it in for `workflow/lfs/lfs_administration` and `lfs/lfs_administration`
   and will print the file and the line where this file is mentioned.
   You may ask why the two greps. Since [we use relative paths to link to
-  documentation](styleguide.md#links)
-  , sometimes it might be useful to search a path deeper.
+  documentation](styleguide.md#links), sometimes it might be useful to search a path deeper.
 - The `*.md` extension is not used when a document is linked to GitLab's
-  built-in help page, that's why we omit it in `git grep`.
+  built-in help page, which is why we omit it in `git grep`.
 - Use the checklist on the "Change documentation location" MR description template.
 
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