Fix typos.

[skynavga]

1. change "an data" to "a data" in [data binding context], [data defining context], and 9.3.2.
2. change "the directly" to "that directly" in [simple data embedding].
3. change "combine value" to "combined value" in 7th bullet of 2nd note in 6.1.1.
4. reference to term "sourced data embedding" in 9.1.3 is linked to terms-simple-data-embedding.
5. fix the link targets of the two internal links to tts:border in E.1.35

[nigelmegitt]

5. change tts:writingMode="tblr" to tts:writingMode="rltb" in 10.2.45 example.

What's the motivation for this? The example has a single line of top to bottom text, so the change seems like it would make no difference to the example.

[skynavga]

@nigelmegitt sorry, I meant it should read tbrl; I will edit above comment; p.s. it needs to have block progression direction of right to left in order to have the A glyph rotate clockwise; if block progression direction is left to right, then A will rotate counter-clockwise

[nigelmegitt]

@skynavga ok but still, what difference would it make?

[spoeschel]

6. fix the link targets of the two internal links to tts:border in E.1.35

[nigelmegitt]

@skynavga re #970 (comment) now that we're making rotation be clockwise or not at all, presumably this change (5) is no longer needed?

[skynavga]

@nigelmegitt re: #970 (comment) you are correct