document http.sslCertType and sslKeyType

These useful config options were added in 0a01d41 but lacked documentation.

Signed-off-by: Andrew Carter <[email protected]>

Documentation/config/http.txt

@@ -216,6 +216,18 @@ http.sslBackend::
 	This option is ignored if cURL lacks support for choosing the SSL
 	backend at runtime.
 
+http.sslCertType::
+	Type of client certificate used when fetching or pushing over HTTPS.
+	(e.g. "PEM", "DER", or "P12"). See also libcurl `CURLOPT_SSLCERTTYPE`
+	Can be overridden by the `GIT_SSL_CERT_TYPE` environment variable.
+
+http.sslKeyType::
+	Type of client private key used when fetching or pushing over HTTPS.
+	(e.g. "PEM", "DER", or "ENG"). Particularly useful when set to "ENG"
+	for authenticating with PKCS#11 tokens. See also libcurl
+	`CURLOPT_SSLCERTTYPE` . Can be overridden by the `GIT_SSL_KEY_TYPE`
+	environment variable.
+
 http.schannelCheckRevoke::
 	Used to enforce or disable certificate revocation checks in cURL
 	when http.sslBackend is set to "schannel". Defaults to `true` if
@@ -352,4 +364,4 @@ if embedded in the URL, is always ignored for matching purposes) so that
 equivalent URLs that are simply spelled differently will match properly.
 Environment variable settings always override any matches.  The URLs that are
 matched against are those given directly to Git commands.  This means any URLs
-visited as a result of a redirection do not participate in matching.
+visited as a result of a redirection do not participate in matching.