Fix spelling error and missing formatting.

Author: zygoloid

source/iostreams.tex

@@ -5533,7 +5533,7 @@
 \pnum
 \effects
 Behaves as an unformatted input function (\ref{istream.unformatted}), except that it does not count the number of characters extracted and
-does not affect the value returned by subsequent calls to is.gcount(). After
+does not affect the value returned by subsequent calls to \tcode{is.gcount()}. After
 constructing a sentry object extracts characters as long as the next available
 character \tcode{c} is whitespace or until there are no more characters in the sequence.
 Whitespace characters are distinguished with the same criterion as used by

source/lib-intro.tex

@@ -2614,7 +2614,7 @@
 threads may introduce a data race. The conditions under which this may occur are specified
 in~\ref{res.on.data.races}. \begin{note} Modifying an object of a standard library type that is
 shared between threads risks undefined behavior unless objects of that type are explicitly
-specified as being sharable without data races or the user supplies a locking mechanism. \end{note}
+specified as being shareable without data races or the user supplies a locking mechanism. \end{note}
 
 \pnum
 If an object of a standard library type is accessed, and