docs: use specific git add command to avoid adding unnecessary files

[dgp1130]

Today when releasing v9 and v10, I found two extra files in Git (.husky/ and .ng-dev.log). These are a part of the toolchain in later versions, but not known ignored in older versions. Using git commit -a would have included both of those files in the release commit which would not be desirable. Instead, the solution for releases is to add the specific files that are modified to remove this possibility.

I'll do a separate PR to back-port the .gitignore updates to those branches and start a broader discussion about how we should manage .gitignore for LTS branches.

cc @kyliau @josephperrott for visibility to other caretakers.

[dgp1130]

Charles pointed out that git add . doesn't apply to untracked files (untracked vs. unstaged strikes again!), so it likely would not have been an issue in this case. Nonetheless, I think this is still worth merging if for no other reason than to reminder releasers that other changes might be accidentally included as well.

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