Fix some manpage typos

This is based on a pair of patches from A. Costa. I couldn't apply
those directly, since they changed the generated *roff files, not
the asciidoc source.

Fixes Tor bug 6500 and Debian bug 683359.

changes/bug6500

@@ -0,0 +1,2 @@
+  o Minor bugfixes:
+    - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.

doc/tor.1.txt

@@ -169,7 +169,7 @@ GENERAL OPTIONS
     duty of that proxy to properly forward the traffic to the bridge. +
  +
     In its second form, when set along with a corresponding Bridge line, the Tor
-    client launches the pluggable transport proxy exacutable in
+    client launches the pluggable transport proxy executable in
     __path-to-binary__ using __options__ as its command-line options, and
     forwards its traffic to it. It's the duty of that proxy to properly forward
     the traffic to the bridge.
@@ -1709,7 +1709,7 @@ DIRECTORY AUTHORITY SERVER OPTIONS
 
 **V3BandwidthsFile** __FILENAME__::
     V3 authoritative directories only. Configures the location of the
-    bandiwdth-authority generated file storing information on relays' measured
+    bandwidth-authority generated file storing information on relays' measured
     bandwidth capacities. (Default: unset)
 
 **V3AuthUseLegacyKey** **0**|**1**::

doc/torify.1.txt

@@ -21,7 +21,7 @@ DESCRIPTION
 wrapper available on a system. It calls torsocks or tsocks with a tor specific
 configuration file. +
 
-torsocks is an improved wrapper that explictly rejects UDP, safely resolves DNS
+torsocks is an improved wrapper that explicitly rejects UDP, safely resolves DNS
 lookups and properly socksifies your TCP connections. +
 
 tsocks itself is a wrapper between the tsocks library and the application that