Auto merge of #6270 - ClashTheBunny:clarify_allow_deny_enable_disable, r=flip1995
Auto merge of #6270 - ClashTheBunny:clarify_allow_deny_enable_disable, r=flip1995

Clarify allow/warn/deny documentation.  Remove enable/disable.

Disable and enable when not specifically explained were not clear to me
as an English language speaker, but I was able to figure it out fairly
easily due to the examples having A/W, which I assumed meant `allow` and
`warn`.  I removed both words to be sure it was clear as well as
extending the note on what deny means.  It now includes a statement on
exactly what each word means.

Documentation only update.

*Please keep the line below*
changelog: none

aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust