Fix the styles of code styles

src/data/markdown/docs/02 javascript api/08 k6-metrics/70 Counter.md

@@ -24,7 +24,7 @@ For example:
 
 <CodeGroup labels={["Simple example"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import { Counter } from 'k6/metrics';
 
 var myCounter = new Counter('my_counter');
@@ -39,7 +39,7 @@ export default function() {
 
 <CodeGroup labels={["Simple Threshold usage"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import http from "k6/http";
 import { Counter } from "k6/metrics";
 
@@ -58,7 +58,7 @@ export default function() {
 
 <CodeGroup labels={["Advanced Thresholds"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import { Counter } from 'k6/metrics';
 import { sleep } from 'k6';
 import http from 'k6/http';

src/data/markdown/docs/02 javascript api/08 k6-metrics/72 Rate.md

@@ -26,7 +26,7 @@ The value of the `rate` variable ranges between `0.00` and `1.00`.
 
 <CodeGroup labels={["Simple example"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import { Rate } from 'k6/metrics';
 
 var myRate = new Rate('my_rate');
@@ -43,7 +43,7 @@ export default function() {
 
 <CodeGroup labels={["Usage in Thresholds"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import { Rate } from 'k6/metrics';
 import { sleep } from 'k6';
 import http from 'k6/http';

src/data/markdown/docs/02 javascript api/08 k6-metrics/73 Trend.md

@@ -42,7 +42,7 @@ The unit of these variables and functions are all in milliseconds.
 
 <CodeGroup labels={["Simple example"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import { Trend } from 'k6/metrics';
 
 var myTrend = new Trend('my_trend');
@@ -57,7 +57,7 @@ export default function() {
 
 <CodeGroup labels={["Usage in Thresholds"]} lineNumbers={[true]}>
 
-```javaScript
+```javascript
 import { Trend } from 'k6/metrics';
 import { sleep } from 'k6';
 import http from 'k6/http';