pgAdmin 4 commit: Fixes following OSX native keyboard shortcuts in Quer

Fixes following OSX native keyboard shortcuts in Query Tool:
  1) option+arrow (L/R) should skip by "word"
  2) option+arrow (up/down) should go up/down one line
  3) shift+option+arrow (L/R) should select/highlight by "word"

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=d9574f3caabdcbc7d5446f76a14f2519372cd19c
Author: Nagesh Dhope <nagesh.dhope@enterprisedb.com>

Modified Files
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docs/en_US/release_notes_4_21.rst        | 1 +
web/pgadmin/browser/static/js/browser.js | 5 ++---
2 files changed, 3 insertions(+), 3 deletions(-)