Standardize jasmine test describe block names that test specific methods

spec/javascripts/behaviors/bind_in_out_spec.js

spec/javascripts/blob/target_branch_dropdown_spec.js

spec/javascripts/gl_form_spec.js

spec/javascripts/helpers/class_spec_helper_spec.js

spec/javascripts/line_highlighter_spec.js

spec/javascripts/merge_request_tabs_spec.js

spec/javascripts/shortcuts_issuable_spec.js

spec/javascripts/version_check_image_spec.js

spec/javascripts/visibility_select_spec.js