doc: improve eventLoopUtilization documentation

PR-URL: nodejs#35479
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

doc/api/perf_hooks.md

@@ -58,9 +58,10 @@ Performance Timeline. If `name` is provided, removes only the named mark.
 added: v14.10.0
 -->
 
-* `utilization1` {Object} The result of a previous call to `eventLoopUtilization()`
-* `utilization2` {Object} The result of a previous call to `eventLoopUtilization()`
-    prior to `util1`
+* `utilization1` {Object} The result of a previous call to
+    `eventLoopUtilization()`.
+* `utilization2` {Object} The result of a previous call to
+    `eventLoopUtilization()` prior to `utilization1`.
 * Returns {Object}
   * `idle` {number}
   * `active` {number}
@@ -70,9 +71,9 @@ The `eventLoopUtilization()` method returns an object that contains the
 cumulative duration of time the event loop has been both idle and active as a
 high resolution milliseconds timer. The `utilization` value is the calculated
 Event Loop Utilization (ELU). If bootstrapping has not yet finished, the
-properties have the value of 0.
+properties have the value of `0`.
 
-`utilization1` and `utilization2` are optional parameters.
+Both `utilization1` and `utilization2` are optional parameters.
 
 If `utilization1` is passed, then the delta between the current call's `active`
 and `idle` times, as well as the corresponding `utilization` value are
@@ -102,8 +103,8 @@ setImmediate(() => {
 ```
 
 Although the CPU is mostly idle while running this script, the value of
-`utilization` is 1. This is because the call to [`child_process.spawnSync()`][]
-blocks the event loop from proceeding.
+`utilization` is `1`. This is because the call to
+[`child_process.spawnSync()`][] blocks the event loop from proceeding.
 
 Passing in a user-defined object instead of the result of a previous call to
 `eventLoopUtilization()` will lead to undefined behavior. The return values