fix spelling errors

examples/extract_txt_with_page.rs

@@ -16,22 +16,22 @@ fn main() {
 }
 
 struct PagePlainTextOutput {
-    inner: PlainTextOutput<OutputWarpper>,
+    inner: PlainTextOutput<OutputWrapper>,
     pages: HashMap<u32, String>,
     current_page: u32,
     reader: Rc<RefCell<String>>,
 }
 
-struct OutputWarpper(Rc<RefCell<String>>);
+struct OutputWrapper(Rc<RefCell<String>>);
 
-impl std::fmt::Write for OutputWarpper {
+impl std::fmt::Write for OutputWrapper {
     fn write_str(&mut self, s: &str) -> std::fmt::Result {
         self.0.borrow_mut().write_str(s).map_err(|_| fmt::Error)
     }
 }
 
-impl ConvertToFmt for OutputWarpper {
-    type Writer = OutputWarpper;
+impl ConvertToFmt for OutputWrapper {
+    type Writer = OutputWrapper;
 
     fn convert(self) -> Self::Writer {
         self
@@ -46,7 +46,7 @@ impl PagePlainTextOutput {
             pages: HashMap::new(),
             current_page: 0,
             reader: s,
-            inner: PlainTextOutput::new(OutputWarpper(writer)),
+            inner: PlainTextOutput::new(OutputWrapper(writer)),
         }
     }
 }