docs: small improvement to library reference section

[ChrisCarini]

There are two unneeded . and the grammar seems off (ie, is vs are).

[coffee-hue]

Hi I'm looking for an open source project to help with for my portfolio I would be happy to proof read your documentation to see if there is any issues if I could be signed this issue

Thanks

[Rae84]

Hi, I am fairly new regarding contribution in open source projects and looking to start contributing and building my portfolio. I could see this issue for first timers and since it hasn't been resolved yet, I would be super keen to solve this issue as fast as possible if I could be assigned this particular issue. Thanks!