Use backticks not vertical bars to denote variables in comments for /sdk

Bug: webrtc:12338
Change-Id: Ifaad29ccb63b0f2f3aeefb77dae061ebc7f87e6c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227024
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34561}
diff --git a/sdk/android/api/org/webrtc/Metrics.java b/sdk/android/api/org/webrtc/Metrics.java
index 3098f72..2533768 100644
--- a/sdk/android/api/org/webrtc/Metrics.java
+++ b/sdk/android/api/org/webrtc/Metrics.java
@@ -18,12 +18,12 @@
 // Rtc histograms can be queried through the API, getAndReset().
 // The returned map holds the name of a histogram and its samples.
 //
-// Example of |map| with one histogram:
-// |name|: "WebRTC.Video.InputFramesPerSecond"
-//     |min|: 1
-//     |max|: 100
-//     |bucketCount|: 50
-//     |samples|: [30]:1
+// Example of `map` with one histogram:
+// `name`: "WebRTC.Video.InputFramesPerSecond"
+//     `min`: 1
+//     `max`: 100
+//     `bucketCount`: 50
+//     `samples`: [30]:1
 //
 // Most histograms are not updated frequently (e.g. most video metrics are an
 // average over the call and recorded when a stream is removed).