fix typos

src/readonly/tree.rs

@@ -178,7 +178,7 @@ impl RoNode {
     NodeType::from_int(xmlGetNodeType(self.0))
   }
 
-  /// Returns true iff it is a text node
+  /// Returns true if it is a text node
   pub fn is_text_node(self) -> bool {
     self.get_type() == Some(NodeType::TextNode)
   }

src/tree/document.rs

@@ -256,7 +256,7 @@ impl Document {
     }
   }
 
-  /// Serializes a `Node` owned by this `Document
+  /// Serializes a `Node` owned by this `Document`
   pub fn node_to_string(&self, node: &Node) -> String {
     unsafe {
       // allocate a buffer to dump into
@@ -278,7 +278,7 @@ impl Document {
       node_string
     }
   }
-  /// Serializes a `RoNode` owned by this `Document
+  /// Serializes a `RoNode` owned by this `Document`
   pub fn ronode_to_string(&self, node: &RoNode) -> String {
     unsafe {
       // allocate a buffer to dump into

src/tree/node.rs

@@ -358,7 +358,7 @@ impl Node {
     }
   }
 
-  /// Returns true iff it is a text node
+  /// Returns true if it is a text node
   pub fn is_text_node(&self) -> bool {
     self.get_type() == Some(NodeType::TextNode)
   }