typos, s/@code/@env/ for envvars

doc/textutils.texi

@@ -165,7 +165,7 @@ Operating on sorted files
 
 @code{ptx}: Produce permuted indexes
 
-* General options in ptx::      Options which affect general program behaviour.
+* General options in ptx::      Options which affect general program behavior.
 * Charset selection in ptx::    Underlying character set considerations.
 * Input processing in ptx::     Input fields, contexts, and keyword selection.
 * Output formatting in ptx::    Types of output format, and sizing the fields.
@@ -1991,7 +1991,7 @@ addition, if the final byte of an input file is not a newline, GNU
 Upon any error, @code{sort} exits with a status of @samp{2}.
 
 @vindex TMPDIR
-If the environment variable @code{TMPDIR} is set, @code{sort} uses its
+If the environment variable @env{TMPDIR} is set, @code{sort} uses its
 value as the directory for temporary files instead of @file{/tmp}.  The
 @samp{-T @var{tempdir}} option in turn overrides the environment
 variable.
@@ -2884,7 +2884,7 @@ line width computations.
 All 256 characters, even @kbd{NUL}s, are always read and processed from
 input file with no adverse effect, even if GNU extensions are disabled.
 However, System V @code{ptx} does not accept 8-bit characters, a few
-control characters are rejected, and the tilda @kbd{~} is condemned.
+control characters are rejected, and the tilde @kbd{~} is condemned.
 
 @item
 Input line length is only limited by available memory, even if GNU
@@ -3443,7 +3443,7 @@ cat "$@@" \
 @subsection Warning messages
 
 @vindex POSIXLY_CORRECT
-Setting the environment variable @code{POSIXLY_CORRECT} turns off the
+Setting the environment variable @env{POSIXLY_CORRECT} turns off the
 following warning and error messages, for strict compliance with
 @sc{POSIX.2}.  Otherwise, the following diagnostics are issued: