refactor(metrics): update comments to follow new naming convention of throwOnEmptyMetrics property

Author: kozub

Diff for: docs/core/metrics.md

@@ -274,12 +274,12 @@ You can flush metrics automatically using one of the following methods:
 * [Middy-compatible](https://github.com/middyjs/middy){target=_blank} middleware
 * class decorator
 
-Using the Middy middleware or decorator will **automatically validate, serialize, and flush** all your metrics. During metrics validation, if no metrics are provided then a warning will be logged, but no exception will be raised.
+Using the Middy middleware or decorator will **automatically validate, serialize, and flush** all your metrics. During metrics validation, if no metrics are provided then a warning will be logged, but no exception will be thrown.
 If you do not use the middleware or decorator, you have to flush your metrics manually.
 
 
 !!! warning "Metric validation"
-    If metrics are provided, and any of the following criteria are not met, a **`RangeError`** exception will be raised:
+    If metrics are provided, and any of the following criteria are not met, a **`RangeError`** exception will be thrown:
 
     * Maximum of 9 dimensions
     * Namespace is set only once (or none)

Diff for: packages/metrics/examples/decorator/empty-metrics.ts

@@ -19,7 +19,7 @@ class Lambda implements LambdaInterface {
   @metrics.logMetrics({ throwOnEmptyMetrics: true })
   public handler<TEvent, TResult>(_event: TEvent, _context: Context, _callback: Callback<TResult>): void | Promise<TResult> {
     // Notice that no metrics are added
-    // Since the throwOnEmptyMetrics parameter is set to true, the Powertool throw an Error
+    // Since the throwOnEmptyMetrics parameter is set to true, the Powertool throws an Error
   }
 
 }

Diff for: packages/metrics/examples/empty-metrics.ts

@@ -14,7 +14,7 @@ const metrics = new Metrics();
 
 const lambdaHandler = async (): Promise<void> => {
   // Notice that no metrics are added
-  // Since the throwOnEmptyMetrics parameter is set to true, the Powertool throw an Error
+  // Since the throwOnEmptyMetrics parameter is set to true, the Powertool throws an Error
 };
 
 const handlerWithMiddleware = middy(lambdaHandler)

Diff for: packages/metrics/src/Metrics.ts

@@ -35,7 +35,7 @@ const DEFAULT_NAMESPACE = 'default_namespace';
  * If you are used to TypeScript Class usage to encapsulate your Lambda handler you can leverage the [@metrics.logMetrics()](./_aws_lambda_powertools_metrics.Metrics.html#logMetrics) decorator to automatically:
  *   * create cold start metric
  *   * flush buffered metrics
- *   * raise on empty metrics
+ *   * throw on empty metrics
  *
  * @example
  *
@@ -202,7 +202,7 @@ class Metrics implements MetricsInterface {
   }
 
   /**
-   * A decorator automating coldstart capture, raise on empty metrics and publishing metrics on handler exit.
+   * A decorator automating coldstart capture, throw on empty metrics and publishing metrics on handler exit.
    *
    * @example
    *