Docs: Add a group of APIs for which group is not declared in elm_config

Docs: Add a group of APIs for which group is not declared in elm_config

Summary:
Longpress
   elm_config_longpress_timeout_get
   elm_config_longpress_timeout_set
SotfCursor
   elm_config_softcursor_mode_set
   elm_config_softcursor_mode_get
Tooltips (Add in Elm_Tooltips)
   elm_config_tooltip_delay_get
   elm_config_tooltip_delay_set

Test Plan: make doc

Reviewers: cedric, Hermet, zmike, Jaehyun_Cho

Reviewed By: Jaehyun_Cho

Subscribers: #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D7093

Change-Id: I86a098b2384eecb65b6975a313f0b65d9734e8c0