Fix a number of minor markup errors.

Doc/lib/libcurses.tex

@@ -510,8 +510,8 @@ file descriptor for typeahead checking.
 \begin{funcdesc}{unctrl}{ch}
 Returns a string which is a printable representation of the character
 \var{ch}.  Control characters are displayed as a caret followed by the
-character, for example as \verb|^C|. Printing characters are left as they
-are.
+character, for example as \code{\textasciicircum C}. Printing
+characters are left as they are.
 \end{funcdesc}
 
 \begin{funcdesc}{ungetch}{ch}

Doc/lib/librandom.tex

@@ -98,10 +98,10 @@ Bookkeeping functions:
 \begin{funcdesc}{seed}{\optional{x}}
   Initialize the basic random number generator.
   Optional argument \var{x} can be any hashable object.
-  If \var(x) is omitted or \code{None}, current system time is used;
+  If \var{x} is omitted or \code{None}, current system time is used;
   current system time is also used to initialize the generator when the
   module is first imported.
-  If \var(x) is not \code{None} or an int or long,
+  If \var{x} is not \code{None} or an int or long,
   \code{hash(\var{x})} is used instead.
   If \var{x} is an int or long, \var{x} is used directly.
   Distinct values between 0 and 27814431486575L inclusive are guaranteed
@@ -137,7 +137,7 @@ Bookkeeping functions:
   Change the internal state to what it would be if \function{random()}
   were called \var{n} times, but do so quickly.  \var{n} is a
   non-negative integer.  This is most useful in multi-threaded
-  programs, in conjuction with multiple instances of the \var{Random}
+  programs, in conjuction with multiple instances of the \class{Random}
   class: \method{setstate()} or \method{seed()} can be used to force
   all instances into the same internal state, and then
   \method{jumpahead()} can be used to force the instances' states as

Doc/lib/libstdtypes.tex

@@ -885,11 +885,11 @@ arbitrary objects):
           {(3)}
   \lineiii{\var{a}.values()}{a copy of \var{a}'s list of values}{(2)}
   \lineiii{\var{a}.get(\var{k}\optional{, \var{x}})}
-          {\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}}},
+          {\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}},
            else \var{x}}
           {(4)}
   \lineiii{\var{a}.setdefault(\var{k}\optional{, \var{x}})}
-          {\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}}},
+          {\code{\var{a}[\var{k}]} if \code{\var{k} in \var{a}},
            else \var{x} (also setting it)}
           {(5)}
   \lineiii{\var{a}.popitem()}