4 typo fixes: be use => be used

Author: McDutchie

src/cmd/ksh93/data/builtins.c

@@ -1734,7 +1734,7 @@ USAGE_LICENSE
 	"moved to \aname\a.  The original variable will be unset.  Cannot be "
 	"used with any other options.]"
 "[n?Name reference.  The value is the name of a variable that \aname\a "
-	"references.  \aname\a cannot contain a \b.\b.  Cannot be use with "
+	"references.  \aname\a cannot contain a \b.\b.  Cannot be used with "
 	"any other options.]"
 "[p?Causes the output to be in a format that can be used as input to the "
 	"shell to recreate the attributes for variables.]"

src/cmd/ksh93/include/argnod.h

@@ -66,7 +66,7 @@ struct slnod 	/* struct for link list of stacks */
 };
 
 /*
- * This struct is use to hold $* lists and arrays
+ * This struct is used to hold $* lists and arrays
  */
 
 struct dolnod

src/cmd/ksh93/sh.1

@@ -2895,7 +2895,7 @@ The floating point constants
 .B Nan
 and
 .B Inf
-can be use to represent "not a number" and infinity respectively.
+can be used to represent "not a number" and infinity respectively.
 Integer constants follow the ANSI-C programming language
 integer constant conventions although only single byte
 character constants are recognized and character casts
@@ -6525,7 +6525,7 @@ format file.
 .BI %( date-format )T
 A
 .BI %( date-format )T
-format can be use to treat an argument as a date/time string
+format can be used to treat an argument as a date/time string
 and to format the date/time according to the
 .I date-format\^
 as defined for the