Fix tiny typo in htools.rst
Fix tiny typo in htools.rst

Backtracking through git blame, it turns out than commit 49148d15
changed "\fB20,102400,16384,4\fR" into "**B20,102400,16384,4**". But
of course that's a mistake, since the markup was \fB, not just \f.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Agata Murawska <4c8886dbe342c6966e25105100cfee09458faa93@google.com>

ganeti/ganeti,apyrgio/snf-ganeti,bitemyapp/ganeti,andir/ganeti,onponomarev/ganeti,apyrgio/snf-ganeti,andir/ganeti,leshchevds/ganeti,yiannist/ganeti,mbakke/ganeti,grnet/snf-ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,leshchevds/ganeti,leshchevds/ganeti,andir/ganeti,mbakke/ganeti,dimara/ganeti,apyrgio/ganeti,bitemyapp/ganeti,dimara/ganeti,ganeti/ganeti,grnet/snf-ganeti,onponomarev/ganeti,yiannist/ganeti,yiannist/ganeti