docs: update readme

Author: mamoonraja

README.md

@@ -130,7 +130,7 @@ You supply either an IAM service **API key** or an **access token**:
 
 ```ruby
 # In the constructor, letting the SDK manage the IAM token
-authenticator = IBMWatson::Authenticators::::IamAuthenticator.new(
+authenticator = IBMWatson::Authenticators::IamAuthenticator.new(
   apikey: "<iam_apikey>",
   url: "<iam_url>" # optional - the default value is https://iam.cloud.ibm.com/identity/token
 )
@@ -144,7 +144,7 @@ discover.service_url = "<service-url>" # setting service url
 #### Supplying the access token
 
 ```ruby
-authenticator = IBMWatson::Authenticators::::BearerTokenAuthenticator.new(
+authenticator = IBMWatson::Authenticators::BearerTokenAuthenticator.new(
   bearer_token: "<access_token>"
 )
 discovery = IBMWatson::DiscoveryV1.new(version: "2017-10-16", authenticator)
@@ -157,7 +157,7 @@ require "ibm_watson"
 require "ibm_cloud_sdk_core"
 include IBMWatson
 # In the constructor
-authenticator = IBMWatson::Authenticators::::BasicAuthenticator.new(
+authenticator = IBMWatson::Authenticators::BasicAuthenticator.new(
   username: "<username>",
   password: "<password>"
 )
@@ -177,7 +177,7 @@ Requests can be sent asynchronously. There are two asynchronous methods availabl
 When `await` is used, the request is made synchronously.
 
 ```ruby
-authenticator = IBMWatson::Authenticators::::BasicAuthenticator.new(
+authenticator = IBMWatson::Authenticators::BasicAuthenticator.new(
   username: "<username>",
   password: "<password>"
 )
@@ -196,7 +196,7 @@ output = future.value # The response is accessible at future.value
 When `async` is used, the request is made asynchronously
 
 ```ruby
-authenticator = IBMWatson::Authenticators::::BasicAuthenticator.new(
+authenticator = IBMWatson::Authenticators::BasicAuthenticator.new(
   username: "<username>",
   password: "<password>"
 )
@@ -350,7 +350,7 @@ The SDK will manage the token for the user
 
 ```ruby
 
-authenticator = IBMWatson::Authenticators::::CLoudPakForDataAuthenticator.new(
+authenticator = IBMWatson::Authenticators::CLoudPakForDataAuthenticator.new(
   username: "<username>",
   password: "<password>",
   url: "<authentication url>",