Docs - Update menus guidelines

[edonehoo]

Follow-up to #4555

Application launcher:

• Remove or replace “elements” description
• Fix capitalization in the elements list
• Link to masthead
• Add quotes to references to Favorites
• General phrasing update
• Move Examples within Usage

Dropdown:

• Link to “basic panel variant” does not exist
• Cross link to other components where relevant/mentioned
• Variations section - remove usage of “above”
• Maybe break variations image into 4 separate images, within each variation section
• Update icon reference to be fa-icon
• Remove usage of “two”

Menu:

• change ““>” character” to mention the icon
• remove usage of “two”, “one”, etc.
• link flyout example to the HTML example
• Change fly-out to flyout to match Core
• Change from “Multi-level fly-out menus” to just “Flyout menus”
• Change “red text” to “danger” or whatever our tokens call it
• Fix examples in the disabled menu section

Select:

• replace usage of “one” “two” etc
• Replace mention of “gray” with the token name
• Cross link to other components when mentioned
• Should the usage examples be variations technically? Look into
• Remove the numbered example approach in Select list with count
• Standardize use of “View more”, caps and quotes