DOC-13673 update process list for 7.6

[ggray-cb]

Updated the process list for 7.6:

• Added page attributes for the Erlang components so we only have change them in the future, as opposed to search/replacing them each time.
• Edited content to bring it up to current documentation standards.
• Sorted the table content to make finding particular entries easier. Due to the sorting, it's probably easier to review the preview than the diff.

Preview URL: https://preview.docs-test.couchbase.com/docs-server-DOC-13673_update_process_list_7.6/server/current/install/server-processes.html

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