amend comments

Signed-off-by: Liam Hampton <liam.hampton@ibm.com>

category.go

@@ -1,6 +1,6 @@
 package cli
 
-// CommandCategories allows for category manipulation
+// CommandCategories interface allows for category manipulation
 type CommandCategories interface {
 	// AddCommand adds a command to a category, creating a new category if necessary.
 	AddCommand(category string, command *Command)

errors.go

@@ -48,7 +48,7 @@ func (m *multiError) Errors() []error {
 	return errs
 }
 
-// ErrorFormatter is the interface that will format the error output
+// ErrorFormatter is the interface that will suitably format the error output
 type ErrorFormatter interface {
 	Format(s fmt.State, verb rune)
 }