Fix typo: silented --> silenced

changelog.rst

@@ -1518,7 +1518,7 @@ Miscellaneous:
 - Remove the code related to finding out libevent version from setup.py as macro ``USE_LIBEVENT_?`` is no longer needed to build ``gevent.core``.
 - Increased default backlog in all servers (from 5 to 256). Thanks to **Nicholas Piël**.
 - Fixed doc/conf.py to work in Python older than 2.6. Thanks to **Örjan Persson**.
-- Silented SystemError raised in :mod:`backdoor` when a client typed ``quit()``.
+- Silenced SystemError raised in :mod:`backdoor` when a client typed ``quit()``.
 - If importing :mod:`greenlet` failed with ImportError, keep the original error message,
   because sometimes the error originates in setuptools.
 - Changed :func:`select.select` to return all the file descriptors signalled, not just the first one.

src/gevent/_socket2.py

@@ -249,7 +249,7 @@ class socket(object):
             if type(ex) is error: # pylint:disable=unidiomatic-typecheck
                 return ex.args[0]
             else:
-                raise  # gaierror is not silented by connect_ex
+                raise  # gaierror is not silenced by connect_ex
 
     def dup(self):
         """dup() -> socket object

src/gevent/_socket3.py

@@ -316,7 +316,7 @@ class socket(object):
         except timeout:
             return EAGAIN
         except gaierror:
-            # gaierror/overflowerror/typerror is not silented by connect_ex;
+            # gaierror/overflowerror/typerror is not silenced by connect_ex;
             # gaierror extends OSError (aka error) so catch it first
             raise
         except error as ex: