added suggestion to allow use of synchronous=OFF with Sqlite

diff --git a/doc/todo/add_option_to_use_sqlite__39__s_synchronous__61__OFF.mdwn b/doc/todo/add_option_to_use_sqlite__39__s_synchronous__61__OFF.mdwn
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+Sqlite docs [say](https://www.sqlite.org/pragma.html#pragma_synchronous) "commits can be orders of magnitude faster with synchronous OFF".   The downside is a chance of db corruption if power fails at a bad moment, but since git-annex's dbs can be re-generated from git data, maybe that's a tradeoff some users would be ok with?  One usually knows when power has failed.