Update manual pages

doc/h2load.1

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-.TH "H2LOAD" "1" "Apr 06, 2017" "1.22.0-DEV" "nghttp2"
+.TH "H2LOAD" "1" "Apr 09, 2017" "1.22.0-DEV" "nghttp2"
 .SH NAME
 h2load \- HTTP/2 benchmarking tool
 .

doc/nghttp.1

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-.TH "NGHTTP" "1" "Apr 06, 2017" "1.22.0-DEV" "nghttp2"
+.TH "NGHTTP" "1" "Apr 09, 2017" "1.22.0-DEV" "nghttp2"
 .SH NAME
 nghttp \- HTTP/2 client
 .

doc/nghttpd.1

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-.TH "NGHTTPD" "1" "Apr 06, 2017" "1.22.0-DEV" "nghttp2"
+.TH "NGHTTPD" "1" "Apr 09, 2017" "1.22.0-DEV" "nghttp2"
 .SH NAME
 nghttpd \- HTTP/2 server
 .

doc/nghttpx.1

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-.TH "NGHTTPX" "1" "Apr 06, 2017" "1.22.0-DEV" "nghttp2"
+.TH "NGHTTPX" "1" "Apr 09, 2017" "1.22.0-DEV" "nghttp2"
 .SH NAME
 nghttpx \- HTTP/2 proxy
 .
@@ -1207,15 +1207,18 @@ requests.
 .UNINDENT
 .INDENT 0.0
 .TP
-.B \-\-add\-x\-forwarded\-proto
-Append  X\-Forwarded\-Proto header  field  to the  backend
-request.
+.B \-\-no\-add\-x\-forwarded\-proto
+Don\(aqt append  additional X\-Forwarded\-Proto  header field
+to  the   backend  request.   If  inbound   client  sets
+X\-Forwarded\-Proto,                                   and
+\fI\%\-\-no\-strip\-incoming\-x\-forwarded\-proto\fP  option  is  used,
+they are passed to the backend.
 .UNINDENT
 .INDENT 0.0
 .TP
-.B \-\-strip\-incoming\-x\-forwarded\-proto
-Strip X\-Forwarded\-Proto header field from inbound client
-requests.
+.B \-\-no\-strip\-incoming\-x\-forwarded\-proto
+Don\(aqt strip X\-Forwarded\-Proto  header field from inbound
+client requests.
 .UNINDENT
 .INDENT 0.0
 .TP

doc/nghttpx.1.rst

@@ -1094,15 +1094,18 @@ HTTP
     Strip X-Forwarded-For  header field from  inbound client
     requests.
 
-.. option:: --add-x-forwarded-proto
+.. option:: --no-add-x-forwarded-proto
 
-    Append  X-Forwarded-Proto header  field  to the  backend
-    request.
+    Don't append  additional X-Forwarded-Proto  header field
+    to  the   backend  request.   If  inbound   client  sets
+    X-Forwarded-Proto,                                   and
+    :option:`--no-strip-incoming-x-forwarded-proto`  option  is  used,
+    they are passed to the backend.
 
-.. option:: --strip-incoming-x-forwarded-proto
+.. option:: --no-strip-incoming-x-forwarded-proto
 
-    Strip X-Forwarded-Proto header field from inbound client
-    requests.
+    Don't strip X-Forwarded-Proto  header field from inbound
+    client requests.
 
 .. option:: --add-forwarded=<LIST>