doc: clarify http.ClientRequest path description

Clarify `http.ClientRequest` path description.

Fixes: #25864
PR-URL: #26259
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: JungMinu

doc/api/http.md

@@ -638,7 +638,7 @@ Limits maximum response headers count. If set to 0, no limit will be applied.
 added: v0.4.0
 -->
 
-* {string} The request path. Read-only.
+* {string} The request path.
 
 ### request.removeHeader(name)
 <!-- YAML