Fix minor spelling mistakes

Trivial spelling mistake fix in error message text.

* Fix spelling mistake "adminstrator" -> "administrator"
* Fix spelling mistake "specificed" -> "specified"
* Fix spelling mistake "interperted" -> "interpreted"

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#4728

cmd/zinject/zinject.c

@@ -222,7 +222,7 @@ usage(void)
 	    "\tzinject -c <id|all>\n"
 	    "\n"
 	    "\t\tClear the particular record (if given a numeric ID), or\n"
-	    "\t\tall records if 'all' is specificed.\n"
+	    "\t\tall records if 'all' is specified.\n"
 	    "\n"
 	    "\tzinject -p <function name> pool\n"
 	    "\t\tInject a panic fault at the specified function. Only \n"
@@ -289,7 +289,7 @@ usage(void)
 	    "\n"
 	    "\t\tInject an error into the object specified by the '-t' option\n"
 	    "\t\tand the object descriptor.  The 'object' parameter is\n"
-	    "\t\tinterperted depending on the '-t' option.\n"
+	    "\t\tinterpreted depending on the '-t' option.\n"
 	    "\n"
 	    "\t\t-q\tQuiet mode.  Only print out the handler number added.\n"
 	    "\t\t-e\tInject a specific error.  Must be either 'io' or\n"

cmd/zpios/zpios_main.c

@@ -343,7 +343,7 @@ args_init(int argc, char **argv)
 	check_mutual_exclusive_command_lines(fl_cs, "chunksize");
 
 	if (args->pool == NULL) {
-		fprintf(stderr, "Error: Pool not specificed\n");
+		fprintf(stderr, "Error: Pool not specified\n");
 		usage();
 		args_fini(args);
 		return (NULL);

cmd/zpool/zpool_main.c

@@ -5860,7 +5860,7 @@ status_callback(zpool_handle_t *zhp, void *data)
 	case ZPOOL_STATUS_BAD_LOG:
 		(void) printf(gettext("status: An intent log record "
 		    "could not be read.\n"
-		    "\tWaiting for adminstrator intervention to fix the "
+		    "\tWaiting for administrator intervention to fix the "
 		    "faulted pool.\n"));
 		(void) printf(gettext("action: Either restore the affected "
 		    "device(s) and run 'zpool online',\n"