docs: remove spell checker from vale testing until vale bug is resolved (#48456)

With vale 2.21, the spell checker style stopped working.

This commit removes the spell checker from the list of styles to allow Vale to
be used, minus the spell checker, until the bug is resolved or a workaround
can be applied.

PR Close #48456

aio/tools/doc-linter/styles/Angular/Angular_Spelling.yml

@@ -1,11 +0,0 @@
-# Uses the built-in dictionary and filters.
-extends: spelling
-dicpath: ../../dictionaries/en_us/
-message: "Did you really mean '%s'? It wasn't found in our dictionary."
-level: warning
-ignore:
-  - Vocab/Angular.txt # Angular terms
-  - Vocab/Foreign.txt # Foreign language words used in the text
-  - Vocab/Jargon.txt # Computer jargon
-  - Vocab/Names.txt # Names of people, products, and things
-  - Vocab/Web.txt # Web terms