[Improvement]: Clarify git handling of .git-blame-ignore-revs file and blame view (#56328)

Author: sophietheking

content/repositories/working-with-files/using-files/viewing-and-understanding-files.md

@@ -66,7 +66,7 @@ All revisions specified in the `.git-blame-ignore-revs` file, which must be in t
 
 1. Commit and push the changes.
 
-Now when you visit the blame view, the listed revisions will not be included in the blame. You'll see an **Ignoring revisions in .git-blame-ignore-revs** banner indicating that some commits may be hidden:
+In the blame view, revisions are excluded only if the commit **introduced new lines**. If the commit was the last to **modify** a line, it will still appear in blame. You'll see an "Ignoring revisions in .git-blame-ignore-revs" banner indicating that some commits may be hidden:
 
 <!--Page used for the screenshots below: https://github.com/electron/electron/blame/main/lib/browser/ipc-main-internal.ts -->