Doc errors

[Richard Hadsell <hadsell@…>]

I'm just starting to read the Boost.Iostreams documentation and found some minor errors. Perhaps someone would like to make these trivial corrections to help other novices in the future.

(1) 2.1.4. In the implementation of container_device::write, the block that writes remaining characters at the end of the container ("if (result < n) { ... }") should insert characters from 's + result', not from 's': "container_.insert(container_.end(), s + result, s + n);".

(2) 2.1.4. In the implementation of container_device::seek, there are 3 uses of "ios_bas" instead of "ios_base".

(3) 2.1.4. c/striaghforward/straightforward

(4) Function Template tee In the Description section second paragraph, "Device" should be "Sink" (should be "given a Sink or a pair of Sinks").

[Richard Hadsell <hadsell@…>]

(5) Function Template putback: In the Overview, "put" should be "putback".

[Richard Hadsell <hadsell@…>]

(6) Function Template get: In the Example, "(c == boost::iostreams::get(src))" should be "(c = boost::iostreams::get(src))". It should be an assignment, not a comparison.

[Richard Hadsell <hadsell@…>]

(7) Class Template filtering_stream: The heading "filtering_stream::push" does not belong embedded in the description of the constructors. It appears just after the description of the default constructor.

[Richard Hadsell <hadsell@…>]

(8) In Quick Reference: In the Core Components table, the entry for "filtering_streambuf" links to the Class Template filtering_stream page instead of filtering_streambuf.

[Richard Hadsell <hadsell@…>]

(9) Class Template filtering_streambuf: There is an errant heading "filtering_streambuf::push" equivalent to error (7) above.

[Daniel James]

(In [84161]) Fix iostream doc errors. Refs #8460

[Daniel James]

(In [84303]) Merge iostreams to release. Fixes #8315, #8385, #8460.

Not merging the fallthrough macro, as config support hasn't been merged yet. And not merging the build changes, as I don't know if they're ready.