For #19243 - Update metrics documentation. (#19269)

docs/metrics.md

@@ -314,9 +314,9 @@ In addition to those built-in metrics, the following metrics are added to the pi
 | addons.has_enabled_addons |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Whether or not the user has enabled add-ons on the device.  |[mozilla-mobile/fenix#8318](https://github.com/mozilla-mobile/fenix/pull/8318), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
 | addons.has_installed_addons |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Whether or not the user has installed add-ons on the device.  |[mozilla-mobile/fenix#8318](https://github.com/mozilla-mobile/fenix/pull/8318), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
 | addons.installed_addons |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |A list of all installed add-ons on the device.  |[mozilla-mobile/fenix#11080](https://github.com/mozilla-mobile/fenix/pull/11080), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
-| browser.search.ad_clicks |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records clicks of adverts on SERP pages. The key format is ‘<provider-name>’.  |[mozilla-mobile/fenix#10112](https://github.com/mozilla-mobile/fenix/pull/10112), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
+| browser.search.ad_clicks |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records clicks of adverts on SERP pages. The key format is `<provider-name>`.  |[mozilla-mobile/fenix#10112](https://github.com/mozilla-mobile/fenix/pull/10112), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | browser.search.in_content |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records the type of interaction a user has on SERP pages.  |[mozilla-mobile/fenix#10167](https://github.com/mozilla-mobile/fenix/pull/10167), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
-| browser.search.with_ads |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records counts of SERP pages with adverts displayed. The key format is ‘<provider-name>’.  |[mozilla-mobile/fenix#10112](https://github.com/mozilla-mobile/fenix/pull/10112), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
+| browser.search.with_ads |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records counts of SERP pages with adverts displayed. The key format is `<provider-name>`.  |[mozilla-mobile/fenix#10112](https://github.com/mozilla-mobile/fenix/pull/10112), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | engine_tab.kill_background_age |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Measures the age of the engine session of a background tab at the time its content process got killed.  |[mozilla-mobile/fenix#17864](https://github.com/mozilla-mobile/fenix/pull/17864)||2021-12-31 |1 |
 | engine_tab.kill_foreground_age |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Measures the age of the engine session of a foreground (selected) tab at the time its content process got killed.  |[mozilla-mobile/fenix#17864](https://github.com/mozilla-mobile/fenix/pull/17864)||2021-12-31 |1 |
 | engine_tab.kills |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |How often was the content process of a foreground (selected) or background tab killed.  |[mozilla-mobile/fenix#17864](https://github.com/mozilla-mobile/fenix/pull/17864)|<ul><li>foreground</li><li>background</li></ul>|2021-12-31 |1 |