Update replication-log-reader-agent.md

[troymoen1]

Updating the "maxcmdsintran" warning to be clearer in that primary key errors can occur when modifying it under any circumstance, not just w/CDC.

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@troymoen1 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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[Jak-MS]

@MashaMSFT 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

[rwestMSFT]

@troymoen1 The underlying article needs a refresh, so we'll incorporate your changes into an internal PR. When that PR merges, this one will automatically close.