docs: fix the --tls-max description

Reported-by: Tobias Lindgren
Pointed out in #3367

Closes #3368

docs/cmdline-opts/tls-max.d

@@ -4,11 +4,11 @@ Tags: Versions
 Protocols: SSL
 Added: 7.54.0
 Requires: TLS
-See-also: tlsv1.0 tlsv1.1 tlsv1.2
-Help: Use TLSv1.0 or greater
+See-also: tlsv1.0 tlsv1.1 tlsv1.2 tlsv1.3
+Help: Set maximum allowed TLS version
 ---
-VERSION defines maximum supported TLS version. A minimum is defined
-by arguments tlsv1.0 or tlsv1.1 or tlsv1.2.
+VERSION defines maximum supported TLS version. The minimum acceptable version
+is set by tlsv1.0, tlsv1.1, tlsv1.2 or tlsv1.3.
 
 .RS
 .IP "default"

src/tool_help.c

@@ -437,7 +437,7 @@ static const struct helptxt helptext[] = {
   {"-z, --time-cond <time>",
    "Transfer based on a time condition"},
   {"    --tls-max <VERSION>",
-   "Use TLSv1.0 or greater"},
+   "Set maximum allowed TLS version"},
   {"    --tls13-ciphers <list of TLS 1.3 ciphersuites>",
    "TLS 1.3 cipher suites to use"},
   {"    --tlsauthtype <type>",