Update _OnAfterCreated description in LifespanHandler.md

The CEF 147 header no longer says that OnAfterCreated is the first
notification that references the browser, use its current wording.
Also fix "recieved" typo in DoClose.

Author: linesight

api/LifespanHandler.md

@@ -28,7 +28,7 @@ Table of contents:
 | browser | [Browser](Browser.md) |
 | __Return__ | bool |
 
-Called when a browser has recieved a request to close. This may result
+Called when a browser has received a request to close. This may result
 directly from a call to [Browser](Browser.md).`CloseBrowser` or indirectly
 if the
 browser is a top-level OS window created by CEF and the user attempts to
@@ -47,8 +47,8 @@ See complete description of this callback in [cef_life_span_handler.h](https://g
 | browser | [Browser](Browser.md) |
 | __Return__ | void |
 
-Called after a new browser is created. This callback will be the first
-notification that references |browser|.
+Called after a new browser is created. It is now safe to begin performing
+actions with |browser|.
 
 This callback will be executed during browser creation, thus you must call [cefpython](cefpython.md).SetGlobalClientCallback() to use it. The callback name was prefixed with "`_`" to distinguish this special behavior.