Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- change "is is" to "is" or "it is"
- change "the the" to "the"

Approved by: lstewart
Approved by: sahil (mentor)
MFC after: 3 days

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

Clarify that the ELF library only sets the sh_entsize field of a
section header entry if the application is not taking charge of ELF
object layout.

Update (c) years, and bump the manual page's date.

Submitted by: kaiw

Consistently use the word 'flag' to refer to ELF_F_* constants.

MFC after: 1 day

Fix a bug that prevented applications from laying out ELF objects
with section header tables residing in between other sections.

Introduce additional checks for overlaps between section data and
the section header table when the application is performing section
layout.

Document additional error returns.

Reported by: Kai Wang <kaiw27 at gmail dot com>
Approved by: re (rwatson)

Document the additional error returns possible when handling ELF objects
that require extended numbering.

Fix minor formatting issues:

- make document title match filename;
- remove hard sentence breaks, whitespace at EOL, and double whitespace;
- sort SEE ALSO xrefs, adding missing section numbers;
- fix a misspelled macro name.

MFP4: Add an implementation of the ELF(3) and GELF(3) API set.

Bump __FreeBSD_version.

Reviewed by: jb