Add Redis command line configuration options

[keharper]

Community engineering issue

Type of Doc:

• New topic
• Topic Update, Devdoc link: config-guide/redis/redis-pg-cache.html
• Other

Magento 2 GitHub Issue:

Magento 2 GitHub PR: magento/magento2#17078

Magento 2 version:

• 2.1.X
• 2.2.7
• 2.3.X
• back port
• forward port: Code PR: 17449

Notifications of Changes:

• Changes to Admin interface?
• New software requirements?
• New REST endpoints or updated GraphQL query syntax?
• New command line option?

Content

Add the cache-backend-redis-password command line parameter to the first table in config-guide/redis/redis-pg-cache.md for 2.2.7 and 2.3.

Add the page-cache-redis-password command line parameter to the second table in the same documents.