[R] Document dplyr and compute functionality

[asfimport]

Umbrella issue, see subtasks

Reporter: Neal Richardson / @nealrichardson
Assignee: Neal Richardson / @nealrichardson

Subtasks:

• [R] Generate documentation for dplyr function bindings
• [R] Document exceptions to dplyr verb support
• [R] Document exceptions to function binding support

PRs and other links:

• GitHub Pull Request #14387

_{Note: This issue was originally created as ARROW-17665. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 14387
#14387