Fix typos in documentation

Author: yadaiio

README.md

@@ -202,7 +202,7 @@ it will emit an `error` event and then `close` the input stream:
 
 ```php
 $csv->on('error', function (Exception $error) {
-    // an error occured, stream will close next
+    // an error occurred, stream will close next
 });
 ```
 
@@ -346,7 +346,7 @@ it will emit an `error` event and then `close` the input stream:
 
 ```php
 $csv->on('error', function (Exception $error) {
-    // an error occured, stream will close next
+    // an error occurred, stream will close next
 });
 ```
 

examples/users.csv

@@ -7,5 +7,5 @@ fifth,1973-01-01,5.1.1.1
 sixth,1962-01-01,6.1.1.1
 seventh,1951-01-01,7.1.1.1
 eighth,1940-01-01,8.1.1.1
-nineth,1939-01-01,9.1.1.1
+ninth,1939-01-01,9.1.1.1
 tenth,1928-01-01,