CURLOPT_PROXY_SSL_OPTIONS.3: Sync with CURLOPT_SSL_OPTIONS.3

- Copy CURLOPT_SSL_OPTIONS.3 description to CURLOPT_PROXY_SSL_OPTIONS.3.

Prior to this change CURLSSLOPT_NO_PARTIALCHAIN was missing from the
CURLOPT_PROXY_SSL_OPTIONS description.

docs/libcurl/opts/CURLOPT_PROXY_SSL_OPTIONS.3

@@ -28,25 +28,31 @@ CURLOPT_PROXY_SSL_OPTIONS \- set proxy SSL behavior options
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_OPTIONS, long bitmask);
 .SH DESCRIPTION
-Pass a long with a bitmask to tell libcurl about specific SSL behaviors.
-
-\fICURLSSLOPT_ALLOW_BEAST\fP tells libcurl to not attempt to use any
-workarounds for a security flaw in the SSL3 and TLS1.0 protocols.  If this
-option isn't used or this bit is set to 0, the SSL layer libcurl uses may use
-a work-around for this flaw although it might cause interoperability problems
-with some (older) SSL implementations. WARNING: avoiding this work-around
-lessens the security, and by setting this option to 1 you ask for exactly
-that.  This option is only supported for DarwinSSL, NSS and OpenSSL.
-
-\fICURLSSLOPT_NO_REVOKE\fP tells libcurl to disable certificate revocation
-checks for those SSL backends where such behavior is present. This option is
-only supported for Schannel (the native Windows SSL library), with an
-exception in the case of Windows' Untrusted Publishers blacklist which it
-seems can't be bypassed.
+Pass a long with a bitmask to tell libcurl about specific SSL
+behaviors. Available bits:
+.IP CURLSSLOPT_ALLOW_BEAST
+Tells libcurl to not attempt to use any workarounds for a security flaw in the
+SSL3 and TLS1.0 protocols.  If this option isn't used or this bit is set to 0,
+the SSL layer libcurl uses may use a work-around for this flaw although it
+might cause interoperability problems with some (older) SSL
+implementations. WARNING: avoiding this work-around lessens the security, and
+by setting this option to 1 you ask for exactly that.  This option is only
+supported for DarwinSSL, NSS and OpenSSL.
+.IP CURLSSLOPT_NO_REVOKE
+Tells libcurl to disable certificate revocation checks for those SSL backends
+where such behavior is present. This option is only supported for Schannel
+(the native Windows SSL library), with an exception in the case of Windows'
+Untrusted Publishers blacklist which it seems can't be bypassed. (Added in
+7.44.0)
+.IP CURLSSLOPT_NO_PARTIALCHAIN
+Tells libcurl to not accept "partial" certificate chains, which it otherwise
+does by default. This option is only supported for OpenSSL and will fail the
+certificate verification if the chain ends with an intermediate certificate
+and not with a root cert. (Added in 7.68.0)
 .SH DEFAULT
 0
 .SH PROTOCOLS
-All
+All TLS-based protocols
 .SH AVAILABLE
 Added in 7.52.0
 .SH EXAMPLE