Fixed typos in error documentation comments (#3226)

Author: CodeMyst

gems/aws-sdk-core/lib/aws-sdk-core/errors.rb

@@ -68,7 +68,7 @@ def initialize(*args)
       end
     end
 
-    # Rasied when endpoint discovery failed for operations
+    # Raised when endpoint discovery failed for operations
     # that requires endpoints from endpoint discovery
     class EndpointDiscoveryError < RuntimeError
       def initialize(*args)
@@ -78,7 +78,7 @@ def initialize(*args)
       end
     end
 
-    # raised when hostLabel member is not provided
+    # Raised when hostLabel member is not provided
     # at operation input when endpoint trait is available
     # with 'hostPrefix' requirement
     class MissingEndpointHostLabelValue < RuntimeError

gems/aws-sdk-core/lib/seahorse/client/networking_error.rb

@@ -39,7 +39,7 @@ def initialize(error)
 
     end
 
-    # Rasied when trying to use an closed connection
+    # Raised when trying to use an closed connection
     class Http2ConnectionClosedError < StandardError; end
   end
 end