un-nest curl

curl-8.15.0/docs/cmdline-opts/proxy-key.md

@@ -0,0 +1,21 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: proxy-key
+Help: Private key for HTTPS proxy
+Arg: <key>
+Category: proxy tls
+Added: 7.52.0
+Multi: single
+See-also:
+  - proxy-key-type
+  - proxy
+Example:
+  - --proxy-key here -x https://proxy $URL
+---
+
+# `--proxy-key`
+
+Specify the filename for your private key when using client certificates with
+your HTTPS proxy. This option is the equivalent to --key but used in HTTPS
+proxy context.