Fix ScalaDocs written as comments

src/main/scala/org/scalajs/dom/Fetch.scala

@@ -173,12 +173,12 @@ trait ResponseInit extends js.Object {
 @js.native
 trait Body extends js.Object {
 
-  /* Contains a Boolean that indicates whether the body has been read.
-   */
+  /** Contains a Boolean that indicates whether the body has been read.
+    */
   def bodyUsed: Boolean = js.native
 
-  /* Takes a Response stream and reads it to completion. It returns a promise that resolves with an ArrayBuffer.
-   */
+  /** Takes a Response stream and reads it to completion. It returns a promise that resolves with an ArrayBuffer.
+    */
   def arrayBuffer(): js.Promise[ArrayBuffer] = js.native
 
   /** Takes a Response stream and reads it to completion. It returns a promise that resolves with a Blob.

src/main/scala/org/scalajs/dom/crypto/Crypto.scala

@@ -868,9 +868,9 @@ object KeyFormat {
 @js.native
 trait RSAPublicKey extends js.Object {
 
-  /* modulus, as a base64 URL encoded String */
+  /** modulus, as a base64 URL encoded String */
   def n: String = js.native
 
-  /* exponent, as a base64 URL encoded String */
+  /** exponent, as a base64 URL encoded String */
   def e: String = js.native
 }