Add some analysis terms

[chrisburr]

I'll try keep adding to this branch but this can be merged whenever and I'll open a new PR if needed.

[eduardo-rodrigues]

Many of your entries are not written the way people search for things: typically one will search for DOCA rather than Distance of closest approach, which is the definition ;-).

I've just being discussing formatting with Henry, and a nice improvement to ease how entries are each anchor-able, as that's something I wanted asap. We came up with the formatting of the style

DOCA: Distance of closest approach Blabla ...

[chrisburr]

It's now been updated to match the new style

[henryiii]

Perfect, thanks!