docs,rulequery: state the tag quoting rule rather than the test

The draft compile() quoted every Is/IsNot term, which contradicted the
same task's own assertion that a negated tag compiles to .
The implementer resolved it in the direction the tests specify, and the
resolution is right: notmuch reads tag:inbox and tag:"inbox" identically,
counting 5322 either way against the live index, so quoting a tag would
change the stored string without changing what it matches. That breaks
the byte-for-byte round trip this type exists to guarantee.

Restate the comment as the rule rather than as a note about what a test
expects, correct the plan's draft so the remaining tasks do not inherit
the contradiction, and warn the parser task that a quoted tag must not be
read back as a quoting operator.

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