Editorial tweaks to object name rule

[WilcoFiers]

There is an inconsistency between the background which says that screen readers ignore object without an empty name, and the accessibility support section which says that some don't.

Need for Call for Review: none, editorial upcate

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[carlosapaduarte]

Added an "if present" to clarify the usage of fallback content

[carlosapaduarte]

Suggested change

	When the object resource is not loaded, the fallback content is rendered as shown in the Inapplicable Example: "This `object` element does not need an accessible name because it loads no image, audio, or video.". When screen readers encounter an unsupported media format they will also use the fallback content instead of other attributes.
	When the object resource is not loaded, the fallback content, if present, is rendered as shown in the Inapplicable Example: "This `object` element does not need an accessible name because it loads no image, audio, or video.". When screen readers encounter an unsupported media format they will also use the fallback content instead of other attributes.