use title case when mentioning header
@@ -122,7 +122,7 @@ Send a POST request with body {"name": "ahmed", "age": 24}.
Send a GET request with querystring id=5&sort=true.
.TP
\fBxh\fR get \fIhttpbin.org/json x-api-key:12345\fR
-Send a GET request and include a header named x-api-key with value 12345.
+Send a GET request and include a header named X-Api-Key with value 12345.
.TP
echo "[1, 2, 3]" | \fBxh\fR post \fIhttpbin.org/post
Send a POST request with body read from stdin.
