feat: update helmet documentation for strict_transport_security.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

Author: amlel-el-mahrouss

include/boost/http_proto/server/helmet.hpp

@@ -332,12 +332,14 @@ option_pair x_content_type_options();
 option_pair content_security_policy(const helmet::csp_policy& sp);
 
 /** Return HSTS configuration for the host.
-    @param include_subdomains either include_domains or no_subdomains
-    @param preload either preload or no_preload
-    @note use the hsts namespace to set those function values.
-    @return the option_pair to pass to the helmet.
+    @param age Maximum age in seconds for HSTS enforcement.
+    @param include_subdomains either hsts::include_subdomains or hsts::no_subdomains
+    @param preload either hsts::preload or hsts::no_preload
+    @note Use constants from the hsts namespace.
+    @return Header name and value pair.
 */
-option_pair strict_transport_security(std::size_t age, 
+option_pair strict_transport_security(
+        std::size_t age, 
         bool include_subdomains = hsts::include_subdomains, 
         bool preload = hsts::no_preload);