Document CURLINFO_SSL_ENGINES and "--engine".

docs/curl.1

@@ -270,6 +270,11 @@ automatically set the previous URL when it follows a Location: header. The
 ";auto" string can be used alone, even if you don't set an initial referer.
 
 If this option is used several times, the last one will be used.
+.IP "--engine <name>"
+Select the OpenSSL crypto engine to use for cipher
+operations. Use \fI--engine list\fP to print a list of build-time supported
+engines. Note that not all (or none) of the engines may be available at
+run-time.
 .IP "--environment"
 (RISC OS ONLY) Sets a range of environment variables, using the names the -w
 option supports, to easier allow extraction of useful information after having

docs/libcurl/curl_easy_getinfo.3

@@ -89,6 +89,11 @@ than one request if FOLLOWLOCATION is true.
 Pass a pointer to a long to receive the result of the certification
 verification that was requested (using the CURLOPT_SSL_VERIFYPEER option to
 \fIcurl_easy_setopt(3)\fP).
+.IP CURLINFO_SSL_ENGINES
+Pass the address of a 'struct curl_slist *' to receive a linked-list of
+OpenSSL crypto-engines supported. Note that engines are normally implemented
+in separate dynamic libraries. Hence not all the returned engines may be
+available at run-time.
 .IP CURLINFO_CONTENT_LENGTH_DOWNLOAD
 Pass a pointer to a double to receive the content-length of the download. This
 is the value read from the Content-Length: field.