Restore multiline resolver doc comments after #3243

[StevenACoffman]

In #3243, an unintentional change altered how resolver doc comments were rewritten, such that multiline doc comments would only have their first line prefixed with //, causing them to no longer compile.

For instance:

// This is very important resolver
// It will delete the entire universe, all of time and space
        func (r *mutationResolver) DeleteEverything(ctx context.Context, areYouSure bool) ( *graphql1.DeleteEverythingMutation,  error){

Would become this:

// This is very important resolver
 It will delete the entire universe, all of time and space
        func (r *mutationResolver) DeleteEverything(ctx context.Context, areYouSure bool) ( *graphql1.DeleteEverythingMutation,  error){

and no longer compile.

This PR will hopefully restore the old behavior and alter a test so we notice if it fails again.

6b9e40e#diff-86ed98359ce927135cf803c4ac9d4f5de75a42a54d574971f12e86dfbdef9380R75

Signed-off-by: Steve Coffman steve@khanacademy.org

[coveralls]

coverage: 73.399% (-0.03%) from 73.431%
when pulling 74babe1 on multiline_comments
into 910f51b on master.

[StevenACoffman]

@csilvers This should fix the issue.

[StevenACoffman]

@hailyngx @clayne11 Do you remember why this trimLeft is here?