Documented a few smaller functions in Readme

[Spencer-Easton]

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[Spencer-Easton]

signed

[erickoledadevrel]

These numerical headers are meant for listing the required steps to use the library. The information you added is not required however, so I'd prefer that it was documented outside of this section. What about removing the numbering and moving these tips under a "Other features" header, etc.

[erickoledadevrel]

Thanks for writing this up. I've added a couple of comments, and once you address them I'll happily merge this in.

[googlebot]

CLAs look good, thanks!

[Spencer-Easton]

Everything should be good now. Sorry for being 'spammy' about these fixes. Just starting to diving into github as I'm writing a git tool for GAS.