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, 2 insertions, 2 deletions

diff --git a/components/script/dom/webidls/HTMLTableSectionElement.webidl b/components/script/dom/webidls/HTMLTableSectionElement.webidl
index c3909f3f3e0..b2d22b25947 100644
--- a/components/script/dom/webidls/HTMLTableSectionElement.webidl
+++ b/components/script/dom/webidls/HTMLTableSectionElement.webidl
@@ -3,7 +3,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-// http://www.whatwg.org/html/#htmltablesectionelement
+// https://www.whatwg.org/html/#htmltablesectionelement
 interface HTMLTableSectionElement : HTMLElement {
   //readonly attribute HTMLCollection rows;
   //HTMLElement insertRow(optional long index = -1);
@@ -12,7 +12,7 @@ interface HTMLTableSectionElement : HTMLElement {
   // also has obsolete members
 };
 
-// http://www.whatwg.org/html/#HTMLTableSectionElement-partial
+// https://www.whatwg.org/html/#HTMLTableSectionElement-partial
 partial interface HTMLTableSectionElement {
   //         attribute DOMString align;
   //         attribute DOMString ch;