[channel] Fix inaccurate path to index.md

Test: No functional change.
Change-Id: Iaddbdb1264e21338c0d2e13743f9f7dcaea0beee

[channel] Transaction ids will not be 64-bit.

Remove implication that transaction ids may be 64-bit.

Test: no functional change

Change-Id: Id9f362c1890a1f536c6b4fdfb1f3f684f0b7f287

[docs] fix a markdown bolding around "out-of-line"

Test: No functional changes. Only docs.

Change-Id: I67e1610d25807ea498d01365c9462b0fc6875514

[docs] minor cleanup on FIDL wire document

fix bold on bool

Test: gitiles preview
Change-Id: I78d813026209bf555c2c029d91cd7a4f0ab68fcc

[docs] Move FIDL bindings docs to //docs

These documents will re-appear in the //docs repo.

Test: No behavior change
Change-Id: Id92e6ebd0459e731695a09d0778721df002b6c81

[fidl][spec] Replace reply status with ordinal

In the implementation, we used this field in the reply message for the
ordinal rather than a transport-level status. We might introduce a
transport-level status in the future, but we don't have one currently.

Change-Id: I0149c170bb55a552798b5059ddb435079bc82ed5

[fidl][docs] Mention that high txids are for channel call only

FIDL-175 #done

Change-Id: I18c9dc8b418566e56c78f3478427b7186210506f

[cleanup] Fix a spelling nit: "an zx_*" -> "a zx_*"

These are mostly left over from the mx->zx renaming.

Change-Id: Iad6c38e83106b007fa2cbf76aa54806ae15bedae

[docs][fidl] Fix some formatting in the wire format doc

Change-Id: I357807b4914c20e2ee56838dc9cde46765d54d1f

[fidl][docs] Remove references to first-fit packing

This isn't implemented. If we do implement, we can re-add the
documentation.

Change-Id: Ia168b70086c8c0ad048d008e340ef95ccf7fc156

[fidl][docs] Remove references to FIDL_MSG_VMO

We will not be implementing it.

Change-Id: I7e0ee4cf09bd9e4362b7e50d2505edf1e98ddc6e

[docs] Fix event declaration syntax in FIDL docs

Change-Id: I0598ebf77b99e3581a1344dbe12a9db81badf969

[fidl][docs] Refer to fidl as fidl, not fidl2

Change-Id: Id67dc99b0819388586bd43b0794474dfb908f0d5

[docs][fidl] Remove some cruft from fidl docs

While the implementation is in progress, the design more-or-less is
not.

Change-Id: If8cc17c99db63545b799d0d11a8337a018288bf1

[fidl][docs] Remove some dead things from the docs

Change-Id: I650642ac95ea5dcfa178f1e5a6f0afc6225651f8

[docs][fidl] Disallow the zero ordinal

It's too easy for clients to send the zero ordinal by mistake. It should
be an error.

Change-Id: I7b72fd6ad9dddc57eed06e810a1f03f27c320563

[fidl][docs] Update docs to match the FIDL2 examples.

Change-Id: I09578c0728c12fcfeb65081390fb91862ae20d5e

[docs][fidl] Create FIDL markdown documents.

These were converted from google docs automatically, then fixed up
manually.

Note these may not be up to date. kulakowski@ will work on updating them
when he gets back from vacation.

TO-321

Change-Id: If974bcb00a46bfe605a1005287b7b31df717f427