Dart SDK Spelling b, c, and d.

runtime/third_party/double-conversion/src/strtod.cc

Index: runtime/third_party/double-conversion/src/strtod.cc
diff --git a/runtime/third_party/double-conversion/src/strtod.cc b/runtime/third_party/double-conversion/src/strtod.cc
index 17abcbb2a557b5e1973b655a9471008349b8acbf..56d848c1ed7c764e0efc37dc1548af88b6f51ee3 100644
--- a/runtime/third_party/double-conversion/src/strtod.cc
+++ b/runtime/third_party/double-conversion/src/strtod.cc
@@ -528,7 +528,7 @@ float Strtof(Vector<const char> buffer, int exponent) {
          (f1 == f2 && f2 != f3 && f3 == f4) ||
          (f1 == f2 && f2 == f3 && f3 != f4));
 
-  // guess and next are the two possible canditates (in the same way that
+  // guess and next are the two possible candidates (in the same way that
   // double_guess was the lower candidate for a double-precision guess).
   float guess = f1;
   float next = f4;