Clarify output charset in DoubleToAscii documentation (#61)
* Clarify output charset in DoubleToAscii documentation
* Fixing typo in charset docs.

diff --git a/double-conversion/double-conversion.h b/double-conversion/double-conversion.h
index 9978bde..1ccd7fc 100644
--- a/double-conversion/double-conversion.h
+++ b/double-conversion/double-conversion.h

@@ -294,13 +294,18 @@
// should be at least kBase10MaximalLength + 1 characters long.
static const int kBase10MaximalLength = 17;
- // Converts the given double 'v' to ascii. 'v' must not be NaN, +Infinity, or
- // -Infinity. In SHORTEST_SINGLE-mode this restriction also applies to 'v'
- // after it has been casted to a single-precision float. That is, in this
- // mode static_cast<float>(v) must not be NaN, +Infinity or -Infinity.
+ // Converts the given double 'v' to digit characters. 'v' must not be NaN,
+ // +Infinity, or -Infinity. In SHORTEST_SINGLE-mode this restriction also
+ // applies to 'v' after it has been casted to a single-precision float. That
+ // is, in this mode static_cast<float>(v) must not be NaN, +Infinity or
+ // -Infinity.
//
// The result should be interpreted as buffer * 10^(point-length).
//
+ // The digits are written to the buffer in the platform's charset, which is
+ // often UTF-8 (with ASCII-range digits) but may be another charset, such
+ // as EBCDIC.
+ //
// The output depends on the given mode:
// - SHORTEST: produce the least amount of digits for which the internal
// identity requirement is still satisfied. If the digits are printed