bug-bash: Change phase to directive in custom logic doc

[Guaris]

Fixes #7533

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[lena-larionova]

This is missing the second part of the issue as well, which is:

An other issue concerns the "reponse" function, for which the phase is "access". However, according to the description, it replaces "header_filter()" and "body_filter()". As shown in the diagram in the Directives section, they are part of "Content Phase", not "Access Phase". This seems to be a mistake.

Edit: After doing more digging, I found that the response function runs in the Kong response phase, as a whole separate thing: https://github.com/Kong/kong/blob/master/spec/fixtures/custom_plugins/kong/plugins/enable-buffering-response/handler.lua. The links to the directives are correct though (header_filter and body_filter).

See all the Kong phases here: https://github.com/Kong/kong/blob/master/kong/pdk/private/phases.lua

[lena-larionova]

tl;dr for the changes I made to this PR:

• marked ws phases as enterprise only
• added a directives column and renamed the original phases column to "Kong phases", which are not the same thing as the nginx phases
• checked each function against its real phase in Kong; the only one that actually differs from its function name is the configuration function