feat: doc string interpolation for Endpoint documentation

zio-http/src/main/scala/zio/http/endpoint/Endpoint.scala

@@ -29,6 +29,8 @@ import zio.http.Header.Accept.MediaTypeWithQFactor
 import zio.http._
 import zio.http.codec.{HttpCodec, _}
 import zio.http.endpoint.Endpoint.{OutErrors, defaultMediaTypes}
+import zio.http.endpoint.Endpoint.{EndpointDocs,_}
+
 
 /**
  * An [[zio.http.endpoint.Endpoint]] represents an API endpoint for the HTTP

zio-http/src/main/scala/zio/http/endpoint/EndpointDocs.scala

@@ -0,0 +1,20 @@
+// EndpointDocs.scala
+
+object EndpointDocs {
+  implicit class EndpointDocs(val sc: StringContext) extends AnyVal {
+    def doc(args: Any*): String = {
+      // Access the parts of the interpolated string
+      val parts = sc.parts.iterator
+
+      // Combine the parts with the arguments to create the final documentation string
+      val result = new StringBuilder(parts.next())
+      while (parts.hasNext) {
+        val arg = args(parts.nextIndex - 1).toString
+        result.append(arg).append(parts.next())
+      }
+
+      // Return the documentation string
+      result.toString()
+    }
+  }
+}