Fix an amazing number of typos & malformed sentences reported by Detlef
Lannert <lannert@uni-duesseldorf.de>.
diff --git a/Doc/lib/libtime.tex b/Doc/lib/libtime.tex
index 0e14f4c..82007f7 100644
--- a/Doc/lib/libtime.tex
+++ b/Doc/lib/libtime.tex
@@ -35,7 +35,7 @@
integer; this variable is initialized to \code{1} unless the
environment variable \envvar{PYTHONY2K} is set to a non-empty string,
in which case it is initialized to \code{0}. Thus, you can set
-\envvar{PYTHONY2K} in the environment to \code{x} to require 4-digit
+\envvar{PYTHONY2K} to a non-empty string in the environment to require 4-digit
years for all year input. When 2-digit years are accepted, they are
converted according to the \POSIX{} or X/Open standard: values 69-99
are mapped to 1969-1999, and values 0--68 are mapped to 2000--2068.