Fix some typos discovered during casual reading

This is just a collection of typos/minor edits (e.g. "are" → "is") over the past few days. No code changes.

The with_transpose → with_together change seems to be a leftover from when the module was submitted as "transpose" and renamed to "together".

(I won't make a habit of submitting tiny typo-fix pull requests. If they're desired at all, I'll collect them and submit them once the batch is of a reasonable size.)