docs: add missing Arg tag to --stderr

Prior to this change the required argument was not shown. curl.1 before: --stderr curl.1 after: --stderr <file> curl --help before: --stderr Where to redirect stderr curl --help after: --stderr <file> Where to redirect stderr Closes #6692
curl · Mar 4, 2021 · e1655b2 · e1655b2
1 parent dd81489
commit e1655b2
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diff --git a/docs/cmdline-opts/stderr.d b/docs/cmdline-opts/stderr.d
@@ -1,4 +1,5 @@
 Long: stderr
+Arg: <file>
 Help: Where to redirect stderr
 See-also: verbose silent
 Category: verbose

diff --git a/src/tool_help.c b/src/tool_help.c
@@ -742,7 +742,7 @@ static const struct helptxt helptext[] = {
   {"-3, --sslv3",
    "Use SSLv3",
    CURLHELP_TLS},
-  {"    --stderr",
+  {"    --stderr <file>",
    "Where to redirect stderr",
    CURLHELP_VERBOSE},
   {"    --styled-output",