Tweak `@GlobalScope` constants documentation overall

General:
- Replace most type names with strong references (such as "integer" to "[int]");
- Made the writing style closer to how the rest of the documentation is formatted.
- Use uppercase Inspector when referring to the Inspector dock.
- Describe missing MethodFlags, Variant.Type constants.

Key:
- Add " key." to the `KEY_0` to `KEY_9` constants;
- Reword some MouseButton constants;
	- In a programming context, it's kind of odd hearing about the plural of "mouse".

Error:
- Reword OK constant to flow better, use `printerr()` over `print()`;
- Describe where `ERR_HELP` is used by the engine;
- Point to the Github Issues Page in ERR_BUG.

PropertyHint:
- Mention that PROPERTY_HINT_IMAGE_COMPRESS_LOSSY and PROPERTY_HINT_IMAGE_COMPRESS_LOSSLESS are unused;
- Mention that PROPERTY_HINT_PASSWORD allows a placeholder string.
- Describe PROPERTY_HINT_OBJECT_TOO_BIG, PROPERTY_HINT_MAX.

PropertyUsageFlags:
- Describe PROPERTY_USAGE_HIGH_END_GFX, PROPERTY_USAGE_ARRAY.

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