Improves language around gender

[telegraham]

Menu documentation:

1. Adds non-binary gender options
2. Moves "female" up from the end of menus, and ensures no gender has a 0 value

Table documentation:

1. Adds non-binary example person to table documentation
2. Changes careers to be less stereotypical
3. Moves women up in table order
4. Re-words sentences referring to women as "girls"

Comment:

1. Re-words sentence referring to people in general as "guys"

[wley3337]

This is incredibly important, both for the relevance of the documentation to reflect current usage and also for developers to see their whole selves reflected in the tools they use.

[tessneau]

If one calls themselves Semantic then they should live by their name and be accountable for the meaning their documentation conveys.

[lubber-de]

@telegraham Would you like to provide this PR to https://github.com/fomantic/Fomantic-UI-Docs as well? It might get merged there much more sooner 😉 and v2.8.0 of https://github.com/fomantic/Fomantic-UI is scheduled for middle of November