masm/bnf-grammar: Format some literal characters correctly

[lkundrak]

A couple of character literal terminals don't follow consistent formatting. Fix that.

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Learn Build status updates of commit b3dc4de:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/assembler/masm/masm-bnf-grammar.md	✅Succeeded

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[TylerMSFT]

I'm on the fence about the value of these changes. One of the reasons we do code escape is to prevent machine translation of identifiers. But that's not an issue with parenthesis, etc.
I'll take the change since the work is done, but I wouldn't necessarily encourage further work like this unless it is to prevent machine translation from incorrectly modifying a code statement.

[TylerMSFT]

#sign-off

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[TylerMSFT]

Hi, thanks for the changes.