TBR: Typos fixed

Change-Id: I8c48953541a36f516d7a9bd27de85193bf189930
Reviewed-on: https://dart-review.googlesource.com/57825
Reviewed-by: Erik Ernst <eernst@google.com>
diff --git a/docs/language/dartLangSpec.tex b/docs/language/dartLangSpec.tex
index 7bc48ee..2db8dfe 100644
--- a/docs/language/dartLangSpec.tex
+++ b/docs/language/dartLangSpec.tex
@@ -3293,7 +3293,7 @@
   {`\escapegrammar .}' DIGIT+ EXPONENT?
   .
 
-{\bf EXPONENT:}(`e' $|$ `E') (`+' $|$ `-'')? DIGIT+
+{\bf EXPONENT:}(`e' $|$ `E') (`+' $|$ `-')? DIGIT+
   .
 
 {\bf HEX\_NUMBER:}`0x' HEX\_DIGIT+;
@@ -3330,8 +3330,8 @@
 error if $i \ge{} 2^{64}$, unless it is prefixed by a unary minus operator,
 in which case it is a compile-time error if $i \gt{} 2^{63}$.
 If the \code{int} class is implemented as signed 64-bit two's complement integers,
-$i \ge{} 2^63$, and the literal is not prefixed by a unary minus operator, then
-the literal evaluates to an instance of the \code{int} class representing the integer value $i - 2^64$.
+$i \ge{} 2^{63}$, and the literal is not prefixed by a unary minus operator, then
+the literal evaluates to an instance of the \code{int} class representing the integer value $i - 2^{64}$.
 Otherwise the literal evaluates to an instance of the \code{int} class representing
 the integer value $i$,
 and it is a compile-time error if the integer $i$ cannot be represented exactly