chore(tracer): remove redundant export in docs & examples

docs/core/tracer.md

@@ -142,7 +142,7 @@ You can quickly start by importing the `Tracer` class, initialize it outside the
         }
     }
 
-    export const handlerClass = new Lambda();
+    const handlerClass = new Lambda();
     export const handler = handlerClass.handler.bind(handlerClass); // (1)
     ```
 
@@ -255,8 +255,8 @@ You can trace other Class methods using the `captureMethod` decorator or any arb
         }
     }
 
-    export const myFunction = new Lambda();
-    export const handler = myFunction.handler.bind(myFunction); // (1)
+    const handlerClass = new Lambda();
+    export const handler = myFunction.handler.bind(handlerClass); // (1)
     ```
 
     1. Binding your handler method allows your handler to access `this`.

packages/tracer/src/Tracer.ts

@@ -66,7 +66,7 @@ import { Segment, Subsegment } from 'aws-xray-sdk-core';
  *   }
  * }
  * 
- * export const handlerClass = new Lambda();
+ * const handlerClass = new Lambda();
  * export const handler = handlerClass.handler.bind(handlerClass);
  * ```
  * 
@@ -333,7 +333,7 @@ class Tracer extends Utility implements TracerInterface {
    *   }
    * }
    * 
-   * export const handlerClass = new Lambda();
+   * const handlerClass = new Lambda();
    * export const handler = handlerClass.handler.bind(handlerClass);
    * ```
    * 
@@ -410,9 +410,8 @@ class Tracer extends Utility implements TracerInterface {
    *   }
    * }
    * 
-   * export const handlerClass = new Lambda();
-   * export const myMethod = handlerClass.myMethod; 
-   * export const handler = handlerClass.handler; 
+   * const handlerClass = new Lambda();
+   * export const handler = handlerClass.handler.bind(handlerClass);; 
    * ```
    * 
    * @decorator Class

packages/tracer/tests/e2e/allFeatures.decorator.test.functionCode.ts

@@ -87,5 +87,5 @@ export class MyFunctionWithDecorator {
   }
 }
 
-export const handlerClass = new MyFunctionWithDecorator();
+const handlerClass = new MyFunctionWithDecorator();
 export const handler = handlerClass.handler.bind(handlerClass);

packages/tracer/tests/e2e/asyncHandler.decorator.test.functionCode.ts

@@ -82,5 +82,5 @@ export class MyFunctionWithDecorator {
   }
 }
 
-export const handlerClass = new MyFunctionWithDecorator();
+const handlerClass = new MyFunctionWithDecorator();
 export const handler = handlerClass.handler.bind(handlerClass);