* doc/ref/api-memory.texi (Memory Blocks): Recommend against
scm_gc_free. Refer to foreign objects instead of smobs. Remove
discussion of scm_must_malloc et al.
* doc/ref/guile.texi (API Reference): Rename SMOB menu item.
* doc/ref/libguile-snarf.texi (Function Snarfing): Update example to not
refer to smobs.
* doc/ref/tools.texi (How guile-snarf works): Likewise.
* doc/ref/libguile-snarf.texi (Function Snarfing): The s_FOO binding
isn't deprecated; no need to warn people to stop using it. Thanks to
Peter Brett for the hint.