Fix various FTS5 related doc formatting errors

Author: rogerbinns

apsw/fts5.py

@@ -1506,8 +1506,8 @@ def upsert(self, *args: apsw.SQLiteValue, **kwargs: apsw.SQLiteValue) -> int:
 
         The rowid of the inserted/modified row is returned.
 
-        If you are using an [external
-        content](https://www.sqlite.org/fts5.html#external_content_tables)
+        If you are using an `external
+        content <https://www.sqlite.org/fts5.html#external_content_tables>`__
         table:
 
         * The insert will be directed to the external content table

doc/textsearch.rst

@@ -513,7 +513,7 @@ text into ascii text that sounds approximately similar::
 Available auxiliary functions
 =============================
 
-SQLite includes X builtin auxiliary functions, with APSW providing
+SQLite includes 3 builtin auxiliary functions, with APSW providing
 some more.
 
 .. list-table::

examples/fts.py

@@ -319,10 +319,10 @@
 
 ### fts5_auxfunc: Auxiliary functions
 # `Auxiliary functions
-# <https://sqlite.org/fts5.html#_auxiliary_functions_>__ are called
+# <https://sqlite.org/fts5.html#_auxiliary_functions_>`__ are called
 # for each matching row.  They can be used to provide `ranking
 # (sorting)
-# <https://www.sqlite.org/fts5.html#sorting_by_auxiliary_function_results>`__`
+# <https://www.sqlite.org/fts5.html#sorting_by_auxiliary_function_results>`__
 # for determining better matches, or returning information about the
 # match and row such as `highlights
 # <https://www.sqlite.org/fts5.html#the_highlight_function>`__, and