Fixed typo (escaping strategy).
minor #1392 Update internals.rst (ahsio)

This PR was merged into the 1.15-dev branch.

Discussion
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Update internals.rst

Fixed typo (Bad escaping strategy).

Commits
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d0de473 Fixed typo (escaping strategy).
added a note about PEAR deprecation in the docs
removed beta versions for PEAR in the docs
fixed markpu