typos: familly -> family

* bench/ltlcounter/README, doc/org/upgrade2.org: Here.

bench/ltlcounter/README

@@ -16,7 +16,7 @@ describing counters was used to stress many translators.
 For a description of these formulae, you may also see
 http://ti.arc.nasa.gov/m/profile/kyrozier/benchmarking_scripts/node5.html
 
-This benchmark used this familly of formulae to plot the performance
+This benchmark used this family of formulae to plot the performance
 of the ltl2tgba_fm algorithm.  Studying the behaviour of ltl2tgba_fm
 on this class of formulae helped us to improve the translation.
 

doc/org/upgrade2.org

@@ -74,7 +74,7 @@ experience of updating a couple of projects that are using Spot.
 
   7. [[*Various renamings][Several class, functions, and methods, have been renamed]].  Some
      have been completely reimplemented, with different interfaces.
-     In particular the =tgba_explicit_*= familly of classes
+     In particular the =tgba_explicit_*= family of classes
      (=tgba_explicit_formula=, =tgba_explicit_number=,
      =tgba_explicit_string= used to encode a TGBA using a graph whose
      state was named using LTL formulas, integers, or strings) are