doc: fix errors in Performance hooks doc

PR-URL: #43152
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Zeyu "Alex" Yang <himself65@outlook.com>

Author: y1d7ng

doc/api/perf_hooks.md

@@ -64,7 +64,7 @@ added: v16.7.0
 * `name` {string}
 
 If `name` is not provided, removes all `PerformanceMeasure` objects from the
-Performance Timeline. If `name` is provided, removes only the named mark.
+Performance Timeline. If `name` is provided, removes only the named measure.
 
 ### `performance.eventLoopUtilization([utilization1[, utilization2]])`
 
@@ -184,7 +184,7 @@ changes:
 * `options` {Object}
   * `detail` {any} Additional optional detail to include with the mark.
   * `startTime` {number} An optional timestamp to be used as the mark time.
-    **Defaults**: `performance.now()`.
+    **Default**: `performance.now()`.
 
 Creates a new `PerformanceMark` entry in the Performance Timeline. A
 `PerformanceMark` is a subclass of `PerformanceEntry` whose