doc: revise example of assert.CallTracker

In example of tracker.getCalls(), actual and expected
are mismatched. So update expected value.
In example of tracker.report(), user can check report
easily through console.log().
In example of tracker.reset(), defining of tracker is
missed in CJS. Plus, use assert.strictEqual() to check
result.

PR-URL: #47252
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/api/assert.md

@@ -346,7 +346,7 @@ const callsfunc = tracker.calls(func);
 callsfunc(1, 2, 3);
 
 assert.deepStrictEqual(tracker.getCalls(callsfunc),
-                       [{ thisArg: this, arguments: [1, 2, 3 ] }]);
+                       [{ thisArg: undefined, arguments: [1, 2, 3] }]);
 ```
 
 ```cjs
@@ -360,7 +360,7 @@ const callsfunc = tracker.calls(func);
 callsfunc(1, 2, 3);
 
 assert.deepStrictEqual(tracker.getCalls(callsfunc),
-                       [{ thisArg: this, arguments: [1, 2, 3 ] }]);
+                       [{ thisArg: undefined, arguments: [1, 2, 3] }]);
 ```
 
 ### `tracker.report()`
@@ -397,7 +397,7 @@ function func() {}
 const callsfunc = tracker.calls(func, 2);
 
 // Returns an array containing information on callsfunc()
-tracker.report();
+console.log(tracker.report());
 // [
 //  {
 //    message: 'Expected the func function to be executed 2 time(s) but was
@@ -423,7 +423,7 @@ function func() {}
 const callsfunc = tracker.calls(func, 2);
 
 // Returns an array containing information on callsfunc()
-tracker.report();
+console.log(tracker.report());
 // [
 //  {
 //    message: 'Expected the func function to be executed 2 time(s) but was
@@ -458,24 +458,26 @@ const callsfunc = tracker.calls(func);
 
 callsfunc();
 // Tracker was called once
-tracker.getCalls(callsfunc).length === 1;
+assert.strictEqual(tracker.getCalls(callsfunc).length, 1);
 
 tracker.reset(callsfunc);
-tracker.getCalls(callsfunc).length === 0;
+assert.strictEqual(tracker.getCalls(callsfunc).length, 0);
 ```
 
 ```cjs
 const assert = require('node:assert');
 
+const tracker = new assert.CallTracker();
+
 function func() {}
 const callsfunc = tracker.calls(func);
 
 callsfunc();
 // Tracker was called once
-tracker.getCalls(callsfunc).length === 1;
+assert.strictEqual(tracker.getCalls(callsfunc).length, 1);
 
 tracker.reset(callsfunc);
-tracker.getCalls(callsfunc).length === 0;
+assert.strictEqual(tracker.getCalls(callsfunc).length, 0);
 ```
 
 ### `tracker.verify()`