Fix typos in module/

Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Closes #9241

module/zcommon/zfeature_common.c

@@ -485,7 +485,7 @@ zpool_feature_init(void)
 
 	zfeature_register(SPA_FEATURE_RESILVER_DEFER,
 	    "com.datto:resilver_defer", "resilver_defer",
-	    "Support for defering new resilvers when one is already running.",
+	    "Support for deferring new resilvers when one is already running.",
 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL);
 }
 

module/zcommon/zfs_namecheck.c

@@ -74,7 +74,7 @@ get_dataset_depth(const char *path)
 
 	/*
 	 * Keep track of nesting until you hit the end of the
-	 * path or found the snapshot/bookmark seperator.
+	 * path or found the snapshot/bookmark separator.
 	 */
 	for (int i = 0; loc[i] != '\0' &&
 	    loc[i] != '@' &&

module/zcommon/zpool_prop.c

@@ -156,7 +156,7 @@ zpool_name_to_prop(const char *propname)
 
 /*
  * Given a pool property ID, returns the corresponding name.
- * Assuming the pool propety ID is valid.
+ * Assuming the pool property ID is valid.
  */
 const char *
 zpool_prop_to_name(zpool_prop_t prop)