spellcheck the changelog

ChangeLog

@@ -25,8 +25,8 @@ Changes in version 0.3.3.1-alpha - 2018-01-??:
     - Add consensus method 28, which removes IPv6 ORPorts from
       microdescriptors. Now that there are IPv6 ORPorts in the microdesc
       consensus, they are redundant in microdescs. This change is
-      compatible with tor clients on 0.2.8.x and later. (0.2.8.x
-      introduced client IPv6 bootstrap and guard support.)
+      compatible with tor clients on 0.2.8.x and later. (That is to say,
+      with all Tor clients having IPv6 bootstrap and guard support.)
       Implements 23828.
     - Expand the documentation for AuthDirHasIPv6Connectivity when it is
       set by different numbers of authorities. Fixes 23870
@@ -239,7 +239,7 @@ Changes in version 0.3.3.1-alpha - 2018-01-??:
       a few seconds, then stops, and starts again without exiting the
       process. This mode is meant to help us debug various issues with
       ticket 23847. To use this feature, compile with
-      --enable-restart-degbugging, and set the TOR_DEBUG_RESTART
+      --enable-restart-debugging, and set the TOR_DEBUG_RESTART
       environment variable. This is expected to crash a lot, and is
       really meant for developers only. It will likely be removed in a
       future release. Implements ticket 24583.
@@ -264,7 +264,7 @@ Changes in version 0.3.3.1-alpha - 2018-01-??:
       on 0.3.1.7.
 
   o Minor bugfixes (code correctness):
-    - Stop invoking undefined behaviour by using tor_free() on an
+    - Stop invoking undefined behavior by using tor_free() on an
       unaligned pointer in get_interface_addresses_ioctl(). This pointer
       alignment issue exists on x86_64 macOS, but is unlikely to exist
       elsewhere. Fixes bug 24733; bugfix on 0.3.0.0-alpha-dev; not in
@@ -390,7 +390,7 @@ Changes in version 0.3.3.1-alpha - 2018-01-??:
       so was due to the fact that they were always empty meaning never
       used but still looked at in our fast path. Bottom line, it was an
       unused code path.
-    - The majority ot the channel unit tests have been rewritten and the
+    - The majority of the channel unit tests have been rewritten and the
       code coverage has now been raised to 83.6% for channel.c. Closes
       ticket 23709.
     - We've simplify a lot the channel subsystem by removing those