Update WHATWG links to use HTTPS

Extracted this out of #5649

This commit was created with the following commands:

```
find . -iname "*.webidl" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)whatwg.org/https:\1whatwg.org/g'
```

```
find . -iname "*.rs" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)whatwg.org/https:\1whatwg.org/g'
```

1 files changed, 4 insertions, 4 deletions

diff --git a/components/script/dom/htmlscriptelement.rs b/components/script/dom/htmlscriptelement.rs
index 49cf5f257ed..6bfdf6afd9b 100644
--- a/components/script/dom/htmlscriptelement.rs
+++ b/components/script/dom/htmlscriptelement.rs
@@ -96,7 +96,7 @@ impl HTMLScriptElement {
 }
 
 pub trait HTMLScriptElementHelpers {
-    /// Prepare a script (<http://www.whatwg.org/html/#prepare-a-script>)
+    /// Prepare a script (<https://www.whatwg.org/html/#prepare-a-script>)
     fn prepare(self);
 
     /// [Execute a script block]
@@ -126,7 +126,7 @@ pub trait HTMLScriptElementHelpers {
 }
 
 /// Supported script types as defined by
-/// <http://whatwg.org/html/#support-the-scripting-language>.
+/// <https://whatwg.org/html/#support-the-scripting-language>.
 static SCRIPT_JS_MIMES: StaticStringVec = &[
     "application/ecmascript",
     "application/javascript",
@@ -522,12 +522,12 @@ impl<'a> HTMLScriptElementMethods for JSRef<'a, HTMLScriptElement> {
 
     make_setter!(SetSrc, "src");
 
-    // http://www.whatwg.org/html/#dom-script-text
+    // https://www.whatwg.org/html/#dom-script-text
     fn Text(self) -> DOMString {
         Node::collect_text_contents(NodeCast::from_ref(self).children())
     }
 
-    // http://www.whatwg.org/html/#dom-script-text
+    // https://www.whatwg.org/html/#dom-script-text
     fn SetText(self, value: DOMString) {
         let node: JSRef<Node> = NodeCast::from_ref(self);
         node.SetTextContent(Some(value))