CURLOPT_HTTP_VERSION.3: connection re-use goes before version

docs/libcurl/opts/CURLOPT_HTTP_VERSION.3

@@ -28,11 +28,15 @@ CURLOPT_HTTP_VERSION \- specify HTTP protocol version to use
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP_VERSION, long version);
 .SH DESCRIPTION
-Pass \fIversion\fP a long, set to one of the values described below. They
-force libcurl to use the specific HTTP versions. This is not sensible to do
-unless you have a good reason. You have to set this option if you want to use
+Pass \fIversion\fP a long, set to one of the values described below. They ask
+libcurl to use the specific HTTP versions. This is not sensible to do unless
+you have a good reason. You have to set this option if you want to use
 libcurl's HTTP/2 support.
 
+Note that the HTTP version is just a request. libcurl will still prioritize to
+re-use an existing connection so it might then re-use a connection using a
+HTTP version you haven't asked for.
+
 .IP CURL_HTTP_VERSION_NONE
 We don't care about what version the library uses. libcurl will use whatever
 it thinks fit.