docs: shorten help and migration texts to gh-like brevity

Long texts no longer restate the flag list, the instance selection
of tea help environment, the config keys with descriptions or the
team argument rules shown under ARGUMENTS; webhook events come from
services.WebhookEvents; the migration guide refers to tea help
formatting for the terminal layout.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/pull_review.go

@@ -146,12 +146,7 @@ $ tea pr review 13
 
 # Start a pending review with inline comments, then submit it
 $ tea pr review 13 --pending --comments-file inline.json
-$ tea pr review submit 13 --approve
-
-# See who reviewed, then reply to and resolve an inline comment
-$ tea pr review list 13
-$ tea pr review reply 13 36 -b "Done"
-$ tea pr review resolve 36`
+$ tea pr review submit 13 --approve`
 
 func (a *application) pullReviewCommand() *cobra.Command {
 	review := a.reviewCreateCommand("review [<number> | <url> | <branch>]", "Review a pull request or manage its reviews")