Dart SDK Spelling b, c, and d.

runtime/third_party/double-conversion/src/bignum-dtoa.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
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 //  - a scaled (common) denominator.
 //  optionally (used by GenerateShortestDigits to decide if it has the shortest
 //  decimal converting back to v):
 //  - v - m-: the distance to the lower boundary.
 //  - m+ - v: the distance to the upper boundary.
 //
 // v, m+, m-, and therefore v - m- and m+ - v all share the same denominator.
 //
 // Let ep == estimated_power, then the returned values will satisfy:
 //  v / 10^ep = numerator / denominator.
-//  v's boundarys m- and m+:
+//  v's boundaries m- and m+:
 //    m- / 10^ep == v / 10^ep - delta_minus / denominator
 //    m+ / 10^ep == v / 10^ep + delta_plus / denominator
 //  Or in other words:
 //    m- == v - delta_minus * 10^ep / denominator;
 //    m+ == v + delta_plus * 10^ep / denominator;
 //
 // Since 10^(k-1) <= v < 10^k    (with k == estimated_power)
 //  or       10^k <= v < 10^(k+1)
 //  we then have 0.1 <= numerator/denominator < 1
 //           or    1 <= numerator/denominator < 10
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       delta_minus->Times10();
       delta_plus->AssignBignum(*delta_minus);
     } else {
       delta_minus->Times10();
       delta_plus->Times10();
     }
   }
 }
 
 }  // namespace double_conversion