Add "pipe" keyword

Author: kevanstannard

misc_docs/syntax/decorator_send_pipe.mdx

@@ -1,6 +1,6 @@
 ---
 id: "send-pipe-decorator"
-keywords: ["send", "decorator"]
+keywords: ["send", "pipe", "decorator"]
 name: "@bs.send.pipe"
 summary: "This is the `@bs.send.pipe` decorator."
 category: "decorators"