Pure storage removal: Remove documentation

As pure storage is now gone, it no longer needs to be documented.

* doc/lispref/elisp.texi (Top):
* doc/lispref/internals.texi (GNU Emacs Internals): Remove "Pure
Storage" section.
(Building Emacs, Garbage Collection, Writing Emacs Primitives):
* doc/lispref/symbols.texi (Standard Properties): Remove references to
pure storage.
* src/alloc.c (Fgarbage_collect): Remove docstring text referring to
pure storage.

1 files changed, 0 insertions, 4 deletions

diff --git a/src/alloc.c b/src/alloc.c
index ea142fb1076..8c8e1a99829 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -6296,10 +6296,6 @@ where each entry has the form (NAME SIZE USED FREE), where:
   keeps around for future allocations (maybe because it does not know how
   to return them to the OS).
 
-However, if there was overflow in pure space, and Emacs was dumped
-using the \"unexec\" method, `garbage-collect' returns nil, because
-real GC can't be done.
-
 Note that calling this function does not guarantee that absolutely all
 unreachable objects will be garbage-collected.  Emacs uses a
 mark-and-sweep garbage collector, but is conservative when it comes to