Clarify case-insensitive parsing for enum values

The parsing algorithms of the current specification don't mention case-insensitive parsing of the enum-based members (`dir`, `display`, `orientation`), but all browser engines have implemented this:

| User Agent | [`dir`](https://www.w3.org/TR/appmanifest/#dfn-process-the-dir-member) | [`display`](https://www.w3.org/TR/appmanifest/#dfn-process-the-display-member) | [`orientation`](https://www.w3.org/TR/appmanifest/#dfn-process-the-orientation-member) |
| --- | --- | --- | --- |
| Chromium | 🤷🏼‍♂️ [case-insensitive](https://github.com/chromium/chromium/blob/1a2fa6cafcb284d139a1771e6a8c2478c100d797/third_party/blink/common/manifest/manifest_util.cc#L47) | 🤷🏼‍♂️ [case-insensitive](https://github.com/chromium/chromium/blob/be1c4cc5948f4633fdd91b7386f98ecf1bfac355/third_party/blink/common/manifest/manifest_util.cc#L69) | 🤷🏼‍♂️ [case-insensitive](https://github.com/chromium/chromium/blob/be1c4cc5948f4633fdd91b7386f98ecf1bfac355/third_party/blink/common/manifest/manifest_util.cc#L127) |
| Gecko | 🤷🏼‍♂️ [case-insensitive](https://github.com/mozilla/gecko-dev/blob/91c9ad75166a41d6d82d0c913e74ddf26709e4c0/dom/manifest/ManifestProcessor.sys.mjs#L137) | 🤷🏼‍♂️ [case-insensitive](https://github.com/mozilla/gecko-dev/blob/490a1df802d8872f996f8ef4093d54e3c854c8f9/dom/manifest/ManifestProcessor.sys.mjs#L193) | 🤷🏼‍♂️ [case-insensitive](https://github.com/mozilla/gecko-dev/blob/490a1df802d8872f996f8ef4093d54e3c854c8f9/dom/manifest/ManifestProcessor.sys.mjs#L174) |
| WebKit | 🤷🏼‍♂️ [case-insensitive](https://github.com/WebKit/WebKit/blob/cb7f341491b77d31200bd7d273d7a89ae17a52fc/Source/WebCore/Modules/applicationmanifest/ApplicationManifestParser.cpp#L191) | 🤷🏼‍♂️ [case-insensitive](https://github.com/WebKit/WebKit/blob/cb7f341491b77d31200bd7d273d7a89ae17a52fc/Source/WebCore/Modules/applicationmanifest/ApplicationManifestParser.cpp#L217) | 🤷🏼‍♂️ [case-insensitive](https://github.com/WebKit/WebKit/blob/cb7f341491b77d31200bd7d273d7a89ae17a52fc/Source/WebCore/Modules/applicationmanifest/ApplicationManifestParser.cpp#L244) |

User Agent	`dir`	`display`	`orientation`
Chromium	🤷🏼‍♂️ case-insensitive	🤷🏼‍♂️ case-insensitive	🤷🏼‍♂️ case-insensitive
Gecko	🤷🏼‍♂️ case-insensitive	🤷🏼‍♂️ case-insensitive	🤷🏼‍♂️ case-insensitive
WebKit	🤷🏼‍♂️ case-insensitive	🤷🏼‍♂️ case-insensitive	🤷🏼‍♂️ case-insensitive

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Clarify case-insensitive parsing for enum values #1142

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Clarify case-insensitive parsing for enum values #1142

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