pw_docs: Fixup minor typos, add clarifications * pw_preprocessor: Fix a typo in the example code * Correct a few spelling/grammar mistakes * Clarify intent in a couple spots Signed-off-by: Shiva Rajagopal <shivarajagopal@google.com> Change-Id: I3aebc82d219848e884408658eb8e48f3f8fe651d Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/44681 Reviewed-by: Armando Montanez <amontanez@google.com>
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