Updating footnotes for indexeddb.json (#6950)

I was struck today when looking up IndexDB that some of the language in the footnotes is quite emotional. This PR contains updates to simply make them a bit more factual and consistent. (No change to the information itself.)

features-json/indexeddb.json

@@ -612,8 +612,8 @@
   "notes":"",
   "notes_by_num":{
     "1":"Partial support in IE 10 & 11 refers to a number of subfeatures [not being supported](https://indexdb-support-test.glitch.me/). Edge does not support IndexedDB inside blob web workers. [See issue](https://web.archive.org/web/20171213082727/https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/5942817/)",
-    "2":"Partial support in Safari & iOS 8 & 9 refers to [seriously buggy behavior](http://www.raymondcamden.com/2014/09/25/IndexedDB-on-iOS-8-Broken-Bad/) as well as complete lack of support in WebViews.",
-    "3":"Partial support [refers to a bug](https://bugs.webkit.org/show_bug.cgi?id=226547) in version 14.1.1 that causes indexedDB to never load when the browser is initially opened."
+    "2":"Partial support in Safari 7.1 – 9.3 refers to [seriously buggy behavior](http://www.raymondcamden.com/2014/09/25/IndexedDB-on-iOS-8-Broken-Bad/) as well as a lack of support in WebViews.",
+    "3":"Partial support [refers to a bug](https://bugs.webkit.org/show_bug.cgi?id=226547) in Safari 14.1.1 that causes indexedDB to not load when the browser is initially opened."
   },
   "usage_perc_y":97.61,
   "usage_perc_a":0.82,