Improve pdumper doc; say unexec is deprecated

Say that pdumping cannot redump unless -batch is used.  Say that
the traditional unexec dumping method is by default not available,
and is deprecated.  Don't call dump files "portable", as dump files
are not any more portable than the Emacs executables themselves.
Just call them "dump files".  Similar, prefer "portable dumper"
(since the dumper code is portable) to "portable dumping" (since
the dump file is not).  Be more systematic about calling them
"dump files" instead of "dumped images" or whatnot.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/pdumper.h b/src/pdumper.h
index ab2f426c1e9..5d1e9c3aea3 100644
--- a/src/pdumper.h
+++ b/src/pdumper.h
@@ -35,7 +35,7 @@ INLINE_HEADER_BEGIN
    variables to which the Lisp heap points.  It doesn't know anything
    about other C variables.  The functions below allow code from other
    parts of Emacs to tell the portable dumper about other bits of
-   information to preserve in dumped images.
+   information to preserve in dump files.
 
    These memory-records are themselves preserved in the dump, so call
    the functions below only on the !initialized init path, just
@@ -44,7 +44,7 @@ INLINE_HEADER_BEGIN
    There are no special functions to preserve a global Lisp_Object.
    You should just staticpro these.  */
 
-/* Remember the value of THING in dumped images.  THING must not
+/* Remember the value of THING in dump files.  THING must not
    contain any pointers or Lisp_Object variables: these values are not
    valid across dump and load.  */
 #define PDUMPER_REMEMBER_SCALAR(thing)                  \