* scheme-data.texi (Arithmetic): Clarified docs for - and /.
(String Modification): Removed docs for C functions
(scm_substring_move_right_x etc.)
(Keyword Procedures): New section documenting the keyword
procedures from boot-9.scm.
(Vectors): Moved the section before the non-standard data types.
* data-rep.texi (Defining New Types (Smobs)): Adapted description
of smobs and proocedure creation to new terminology.
(Describing a New Type): Removed mentioning of
scm_make_smob_type_mfpe from smob function list and added
deprecation notice for this function.
(Creating Instances): Added description and macro docs for smobs
with 2 or 3 data cells.
(Garbage Collecting Smobs): Removed old docs for SCM_GCTYP16.
(Garbage Collecting Simple Smobs): Added some clarification about
usage and usefulness.
(Non-immediate Datatypes): Changed R4RS reference to R5RS.
(Vector Data): Document type-specific accessors.
