terminal: add alias gr for goroutine and grs for goroutines (#1559)

Documentation/cli/README.md

@@ -241,6 +241,7 @@ Called without arguments it will show information about the current goroutine.
 Called with a single argument it will switch to the specified goroutine.
 Called with more arguments it will execute a command on the specified goroutine.
 
+Aliases: gr
 
 ## goroutines
 List program goroutines.
@@ -257,6 +258,7 @@ Print out info for every goroutine. The flag controls what information is shown
 
 If no flag is specified the default is -u.
 
+Aliases: grs
 
 ## help
 Prints the help message.

pkg/terminal/command.go

@@ -166,7 +166,7 @@ Current limitations:
 	clearall [<linespec>]
 
 If called with the linespec argument it will delete all the breakpoints matching the linespec. If linespec is omitted all breakpoints are deleted.`},
-		{aliases: []string{"goroutines"}, cmdFn: goroutines, helpMsg: `List program goroutines.
+		{aliases: []string{"goroutines", "grs"}, cmdFn: goroutines, helpMsg: `List program goroutines.
 
 	goroutines [-u (default: user location)|-r (runtime location)|-g (go statement location)|-s (start location)] [ -t (stack trace)]
 
@@ -179,7 +179,7 @@ Print out info for every goroutine. The flag controls what information is shown
 	-t	displays stack trace of goroutine
 
 If no flag is specified the default is -u.`},
-		{aliases: []string{"goroutine"}, allowedPrefixes: onPrefix, cmdFn: c.goroutine, helpMsg: `Shows or changes current goroutine
+		{aliases: []string{"goroutine", "gr"}, allowedPrefixes: onPrefix, cmdFn: c.goroutine, helpMsg: `Shows or changes current goroutine
 
 	goroutine
 	goroutine <id>