Fix some typos. (#7115)

src/qe/mbp/mbp_arith.cpp

@@ -674,7 +674,7 @@ namespace mbp {
                     id = mbo.add_var(r, a.is_int(v));
                     tids.insert(v, id);
                 }
-                CTRACE("qe", kv.m_value.is_zero(), tout << mk_pp(v, m) << " has coefficeint 0\n";);
+                CTRACE("qe", kv.m_value.is_zero(), tout << mk_pp(v, m) << " has coefficient 0\n";);
                 if (!kv.m_value.is_zero()) {
                     coeffs.push_back(var(id, kv.m_value));
                 }

src/qe/mbp/mbp_solve_plugin.cpp

@@ -248,7 +248,7 @@ namespace mbp {
             return false;
         }
 
-        // returns `true` if a rewritting happened
+        // returns `true` if a rewriting happened
         bool try_int_mul_solve(expr *atom, bool is_pos, expr_ref &res) {
 
             if (!is_pos)

src/qe/qe.cpp

@@ -157,8 +157,8 @@ namespace qe {
 
         //
         // Partition variables into buckets.
-        // The var_paritions buckets covering disjoint subsets of
-        // the conjuncts. The remaining variables in vars are non-partioned.
+        // The var_partitions buckets covering disjoint subsets of
+        // the conjuncts. The remaining variables in vars are non-partitioned.
         // 
         bool partition_vars(
             unsigned               num_vars,

src/qe/qe_mbp.cpp

@@ -416,7 +416,7 @@ public:
             //don't use mbp_qel on some theories where model evaluation is
             //incomplete This is not a limitation of qel. Fix this either by
             //making mbp choices less dependent on the model evaluation methods
-            //or fix theory rewriters to make terms evalution complete
+            //or fix theory rewriters to make terms evaluation complete
             if (m_use_qel && !has_unsupported_th(fmls)) {
                 bool dsub = m_dont_sub;
                 m_dont_sub = !force_elim;