fix documentation spelling error

roadmap.md

@@ -17,7 +17,7 @@ Complete & Tested:
 - close_handler
 - echo_server & echo_server_tls
 
-Implimented, needs more testing
+Implemented, needs more testing
 - TLS support
 - External io_service support
 - socket_init_handler

websocketpp/common/connection_hdl.hpp

@@ -34,7 +34,7 @@ namespace websocketpp {
 
 /// A handle to uniquely identify a connection.
 /**
- * This type uniquely identifies a connection. It is implimented as a weak
+ * This type uniquely identifies a connection. It is implemented as a weak
  * pointer to the connection in question. This provides uniqueness across
  * multiple endpoints and ensures that IDs never conflict or run out.
  *

websocketpp/extensions/permessage_deflate/enabled.hpp

@@ -50,8 +50,8 @@ namespace extensions {
 /**
  * ### permessage-deflate interface
  *
- * **is_implimented**\n
- * `bool is_implimented()`\n
+ * **is_implemented**\n
+ * `bool is_implemented()`\n
  * Returns whether or not the object impliments the extension or not
  *
  * **is_enabled**\n

websocketpp/http/constants.hpp

@@ -255,7 +255,7 @@ namespace http {
                 case internal_server_error:
                     return "Internal Server Error";
                 case not_implemented:
-                    return "Not Implimented";
+                    return "Not Implemented";
                 case bad_gateway:
                     return "Bad Gateway";
                 case service_unavailable: