- fix indentation errors.
- reformat `cmake/FindmbedTLS.cmake`
- replace a macro with a variable in `example/sftp_RW_nonblock.c`.
- delete macOS macro `_DARWIN_USE_64_BIT_INODE` from the
OS/400 config header, `os400/libssh2_config.h`.
- fix other minor nits.
Closes#983
- add missing `.fi` tags.
- fix misplaced `.nf` tags.
- add `.nf`/`.fi` tags `SYNOPSIS` where missing.
- fix missing/wrong function name from `SH NAME`.
- fix wrong function name in `TH`.
- keep return values in a separate line.
- indent.
- fold long lines.
- deleted `libssh2_channel_direct_streamlocal()`, there is no such function.
- add missing types.
- add missing headers.
Closes#949
