docs: clarify which methods return ShellStrings #934
Merged
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No change to logic, only docs.
In v0.7.0, we introduced ShellStrings and changed most methods to return
them. Docs weren't appropriately updated, so this PR cross-links these
methods to the ShellString docs.
This also expands on the ShellString docs themselves, since there was
room to make this clearer.
Fixes #933