pgAdmin 4 commit: 1) Updated documentation for the delete row button th

1) Updated documentation for the delete row button that only strikeout the row instead of deleting it. Fixes #4734
2) Updated documentation for the query tool toolbar buttons. Fixes #4779

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=ab5d954337e3f8ef1b6f2f3cbf3f71415b2c3182
Author: Abhilasha Narendra <abhilasha.narendra@enterprisedb.com>

Modified Files
--------------
docs/en_US/query_tool_toolbar.rst | 355 ++++++++++++++++++++------------------
docs/en_US/release_notes_4_15.rst |   2 +
2 files changed, 185 insertions(+), 172 deletions(-)