- Fix typoes

ext/simplexml/README

@@ -7,13 +7,13 @@ SimpleXML objects follow four basic rules:
 3) non numeric indices denote attributes
 4) string conversion allows to access TEXT data
 
-When iterating proerties then the extension always iterates over
-all nodes with that element name. Thus method childen() must be 
+When iterating properties then the extension always iterates over
+all nodes with that element name. Thus method children() must be 
 called to iterate over subnodes. But also doing the following:
-foreach $obj->node_name as $elem) {
+foreach ($obj->node_name as $elem) {
   // do something with $elem
 }
-Always result in iteration of 'node_name' elements. So no further 
+always results in iteration of 'node_name' elements. So no further 
 check is needed to distinguish the number of nodes of that type.
 
 When an elements TEXT data is being accessed through a property
@@ -29,6 +29,6 @@ TODO
 ====
 
 At the moment property access to multiple elements of the same
-name returns an array of SimpleXML objetcs. This should be an 
+name returns an array of SimpleXML objects. This should be an 
 object of a new type instead so that all kinds of linkage,
 assignment and deleting would work.