Fix typos

doc/nghttpx.h2r

@@ -49,7 +49,7 @@ Error log
   <datetime> <master-pid> <current-pid> <thread-id> <level> (<filename>:<line>) <msg>
 
   <datetime>
-    It is a conbination of date and time when the log is written.  It
+    It is a combination of date and time when the log is written.  It
     is in ISO 8601 format.
 
   <master-pid>
@@ -200,7 +200,7 @@ By default, session ID is shared by all worker threads.
 
 If :option:`--tls-session-cache-memcached` is given, nghttpx will
 insert serialized session data to memcached with
-``nghttpx:tls-session-cache:`` + lowercased hex string of session ID
+``nghttpx:tls-session-cache:`` + lowercase hex string of session ID
 as a memcached entry key, with expiry time 12 hours.  Session timeout
 is set to 12 hours.
 
@@ -612,7 +612,7 @@ The replacement is done instantly without breaking existing
 connections or requests.  It also avoids any process creation as is
 the case with hot swapping with signals.
 
-The one limitation is that only numeric IP address is allowd in
+The one limitation is that only numeric IP address is allowed in
 :option:`backend <--backend>` in request body unless "dns" parameter
 is used while non numeric hostname is allowed in command-line or
 configuration file is read using :option:`--conf`.

src/shrpx.cc

@@ -1667,7 +1667,7 @@ Connections:
               "/", it  performs exact match against  the request path.
               If  host  is given,  it  performs  a match  against  the
               request host.   For a  request received on  the frontend
-              lister  with "sni-fwd"  parameter enabled,  SNI host  is
+              listener with  "sni-fwd" parameter enabled, SNI  host is
               used instead of a request host.  If host alone is given,
               "/" is  appended to it,  so that it matches  all request
               paths  under the  host  (e.g., specifying  "nghttp2.org"