doc: small fixes in tips and tricks
doc: small fixes in tips and tricks

Change-Id: Ia966bfcaa9465c1266519647f34a7fcae33680ed
Reviewed-on: http://gerrit.aldebaran.lan:8080/10287
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>
Tested-by: gjacob <4a5a09561c3677434062dbc425d548248c165d5e@aldebaran-robotics.com>

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