[w3c/FileAPI] Improve readability of Blob-related statements (#42)

There are several small fixes, and I'd like to discuss about these changes (and improve it if necessary) before some of them are applied.

**line 400**: I suppose that it is not clear about what does "ignore" here mean, so I emphasize its motivation.

**line 500 and related**: I moved one note after the `Attributes` section of `Blob` and another note duplicated in two places just below the `type` attribute definition since the two notes are both `type`-related.

For the duplicated note, I deleted its appearance in two other algorithm descriptions because this note addresses what does "parsable MIME type" mean, while the two algorithms don't refer to that particular definition. So I think it is more proper to put it under `type` attribute definition (in which "parsable MIME type" is referred).

Also, I rewrote this note in a more readable form as I suppose.

**line 520**: `upto` is a typo as I suppose.

**line 610**: I rewrote description of `close()` a more readable form as I suppose.

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/FileAPI/pull/42

-- Commit Summary --

  * Improve readability of Blob-related statements

-- File Changes --

    M index.bs (35)

-- Patch Links --

https://github.com/w3c/FileAPI/pull/42.patch
https://github.com/w3c/FileAPI/pull/42.diff

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