Remove spurious backtick

Fixes #561

I also did a search to find this pattern in the rest of the
documentation.  It does occur but none of them are errors,
meaning I can't add an automation.

Author: rogerbinns

doc/pysqlite.rst

@@ -43,7 +43,7 @@ module:
   through Python 3.14.
 
 * APSW gives all functionality of SQLite including :doc:`full text
-  search (FTS5) <textsearch>`, :doc:`session`, `:ref:`virtual tables
+  search (FTS5) <textsearch>`, :doc:`session`, :ref:`virtual tables
   <virtualtables>`, :ref:`VFS`, :ref:`BLOB I/O <blobio>`,
   :ref:`backups <backup>`, :meth:`logging <apsw.ext.log_sqlite>`,
   :meth:`file control <Connection.file_control>`, and :meth:`tracing