docs: fix namespace rules in x/blob/README.md (backport #2368)

[mergify]

This is an automatic backport of pull request #2368 done by Mergify.
Cherry-pick of 55f4360 has failed:

On branch mergify/bp/v1.x/pr-2368
Your branch is up to date with 'origin/v1.x'.

You are currently cherry-picking commit 55f4360.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x/blob/README.md

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (v1.x@695988e). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v1.x    #2372   +/-   ##
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  Coverage        ?   20.55%           
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  Files           ?      138           
  Lines           ?    15736           
  Branches        ?        0           
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  Hits            ?     3235           
  Misses          ?    12194           
  Partials        ?      307           

[staheri14]

It looks like the final rendered file does not match the changes made by the original PR.

[staheri14]

Looks good now!