[tmpnam-s-wtmpnam-s.md] `char name1[L_tmpnam_s];` → `char name1[L_tmpnam_s + 1];`

[SamuelMarks]

…as per https://pubs.opengroup.org/onlinepubs/9699919799/functions/tmpnam.html

[prmerger-automator[bot]]

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[v-dirichards]

@TylerMSFT

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team