Doc: add disable pgsql chart to summary docs

Add `postgresql.install=false` to summary options for
`doc/installation/deployment`, as people are not reading the advanced docs.
10 jobs for 673-doc-add-psql-disable in 38 minutes and 23 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Prepare
passed #165408335
check_docs_internal_links

00:00:32

passed #165408333
danger-review

00:00:21

 
  Review
passed #165408338
review

00:07:12

passed #165408342
manual
stop_review

00:00:47

 
  Specs
passed #165408344
review_specs

00:07:50

 
  Qa
skipped #165408348
debug_review
failed #165434605
allowed to fail
qa

00:21:09

passed #165408346
review_helm_test

00:00:23

failed #165408351
allowed to fail
qa

00:20:43

 
  Package
passed #165408354
lint_package

00:00:26

 
Name Stage Failure
failed
qa Qa
rspec ./qa/specs/features/browser_ui/3_create/repository/protocol_v2_push_http_spec.rb:6 # Create Push over HTTP using Git protocol version 2 user pushes to the repository
rspec ./qa/specs/features/browser_ui/3_create/merge_request/ee_add_batch_comments_in_merge_request_spec.rb:6 # Create batch comments in merge request user submits, discards batch comments

Randomized with seed 28675

Uploading artifacts...
./gitlab-qa-run-*: found 25 matching files
Uploading artifacts to coordinator... ok
id=165434605 responseStatus=201 Created token=xCEApzK2
ERROR: Job failed: exit code 1