tsearch.3: Minor tweaks to Florian Weimer's patch

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man3/tsearch.3

@@ -45,7 +45,7 @@ tsearch, tfind, tdelete, twalk, tdestroy \- manage a binary search tree
 .PP
 .BI "void twalk_r(const void *" root ", void (*" action ")(const void *" np ,
 .BI "                                   VISIT " which ", void *" closure "),
-.BI "                                   void *" closure);"
+.BI "                                   void *" closure );
 
 .BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
 .B #include <search.h>
@@ -160,11 +160,14 @@ is rather confusing.)
 .BR twalk_r ()
 is similar to
 .BR twalk (),
-but instead of the leval argument, the
+but instead of the
+.I depth
+argument, the
 .I closure
 argument pointer is passed to each invocation of the action callback,
-unchanged.  This pointer can be used to pass information to and from
-to the callback function in a thread-safe fashion, without resorting
+unchanged.
+This pointer can be used to pass information to and from
+the callback function in a thread-safe fashion, without resorting
 to global variables.
 .PP
 .BR tdestroy ()
@@ -209,7 +212,7 @@ return NULL if
 was NULL on entry.
 .SH VERSIONS
 .BR twalk_r ()
-is available since glibc 2.30.
+is available in glibc since version 2.30.
 .SH ATTRIBUTES
 For an explanation of the terms used in this section, see
 .BR attributes (7).