NaCl docs: a few improvements

NaCl docs: a few improvements

* Mention Stack Overflow in more places.
* Add https to a few links that support it, instead of http. I wasn't exhaustive
  in my replacement, we should probably do a full sweep at some point.
* Expand on the languages section a bit.
* Comment out the broken "talk" link.

TEST= none
BUG= none
TBR= binji@chromium.org, jmedley@chromium.org
NOTRY=true
(documentation only change)

Committed: https://chromium.googlesource.com/chromium/src/+/d8377eb3f7c6e38ea2a63801d8a570128b90ebd0

[commit-bot: I haz the power, 2015-01-19 18:08:00]

Patchset 1 (id:??) landed as
https://crrev.com/d8377eb3f7c6e38ea2a63801d8a570128b90ebd0
Cr-Commit-Position: refs/heads/master@{#312133}

[JF, 2015-01-19 18:08:03]

Committed patchset #1 (id:1) manually as
d8377eb3f7c6e38ea2a63801d8a570128b90ebd0 (presubmit successful).

[jpmedley, 2015-01-20 15:43:54]

lgtm

[binji, 2015-01-20 18:34:51]

https://codereview.chromium.org/863543002/diff/1/native_client_sdk/src/doc/fa...
File native_client_sdk/src/doc/faq.rst (right):

https://codereview.chromium.org/863543002/diff/1/native_client_sdk/src/doc/fa...
native_client_sdk/src/doc/faq.rst:240: languages such as Rust_, Go_, or
Objective-C, but there may still be a few rough
This is kind of already mentioned above (Halide, Haskell, etc.) Maybe combine
these?

[JF, 2015-01-20 19:23:12]

https://codereview.chromium.org/863543002/diff/1/native_client_sdk/src/doc/fa...
File native_client_sdk/src/doc/faq.rst (right):

https://codereview.chromium.org/863543002/diff/1/native_client_sdk/src/doc/fa...
native_client_sdk/src/doc/faq.rst:240: languages such as Rust_, Go_, or
Objective-C, but there may still be a few rough
On 2015/01/20 18:34:51, binji wrote:
> This is kind of already mentioned above (Halide, Haskell, etc.) Maybe combine
> these?

Good point, I'll update.