Fix some spelling errors

src/cache.c

@@ -930,7 +930,7 @@ dav_create(dav_node **nodep, dav_node *parent, const char *name, uid_t uid,
     if (ret == EEXIST)
         syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_ERR),
                _("File %s exists on the server but should not. "
-                 "Maybe it is an error in the server's LOCK impementation. "
+                 "Maybe it is an error in the server's LOCK implementation. "
                  "You may try option 'use_locks 0' in davfs2.conf."),
                  (*nodep)->path);
 

src/umount_davfs.c

@@ -208,7 +208,7 @@ main(int argc, char *argv[])
         ps_in = popen(ps_command, "r");
         if (!ps_in) {
             printf("\n");
-            error(EXIT_FAILURE, 0, _("an error occured while waiting; "
+            error(EXIT_FAILURE, 0, _("an error occurred while waiting; "
                   "please wait for %s to terminate"), PROGRAM_NAME);
         }