Update sat_params.pyg

spellcheck from microsoft/z3guide#165

src/sat/sat_params.pyg

@@ -64,7 +64,7 @@ def_module_params('sat',
                           ('ddfw_search', BOOL, False, 'use ddfw local search instead of CDCL'),
                           ('ddfw.init_clause_weight', UINT, 8, 'initial clause weight for DDFW local search'),
                           ('ddfw.use_reward_pct', UINT, 15, 'percentage to pick highest reward variable when it has reward 0'),
-                          ('ddfw.restart_base', UINT, 100000, 'number of flips used a starting point for hessitant restart backoff'),
+                          ('ddfw.restart_base', UINT, 100000, 'number of flips used a starting point for hesitant restart backoff'),
                           ('ddfw.reinit_base', UINT, 10000, 'increment basis for geometric backoff scheme of re-initialization of weights'),
                           ('ddfw.threads', UINT, 0, 'number of ddfw threads to run in parallel with sat solver'),
                           ('prob_search', BOOL, False, 'use probsat local search instead of CDCL'),
@@ -105,7 +105,7 @@ def_module_params('sat',
                           ('lookahead.preselect', BOOL, False, 'use pre-selection of subset of variables for branching'),
                           ('lookahead_simplify', BOOL, False, 'use lookahead solver during simplification'),
                           ('lookahead_scores', BOOL, False, 'extract lookahead scores. A utility that can only be used from the DIMACS front-end'),
-                          ('lookahead.double', BOOL, True, 'enable doubld lookahead'),
+                          ('lookahead.double', BOOL, True, 'enable double lookahead'),
                           ('lookahead.use_learned', BOOL, False, 'use learned clauses when selecting lookahead literal'),
                           ('lookahead_simplify.bca', BOOL, True, 'add learned binary clauses as part of lookahead simplification'),
                           ('lookahead.global_autarky', BOOL, False, 'prefer to branch on variables that occur in clauses that are reduced'),