pgsql: doc: Fix up ALTER TABLESPACE reference page

doc: Fix up ALTER TABLESPACE reference page

The documentation of ALTER TABLESPACE ... MOVE was added without any
markup, not even paragraph breaks. Fix that, and clarify the text in a
few places.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/48f9e3d22ee3e790d4356ab46a13bbf1ed78ccce

Modified Files
--------------
doc/src/sgml/ref/alter_tablespace.sgml | 73 +++++++++++++++++++-------------
1 file changed, 44 insertions(+), 29 deletions(-)

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