Fix typos

examples/cross_calculator/android/readme.txt

@@ -10,7 +10,7 @@ just declared as a native method which will be resolved at runtime. The scripts
 nimbuild.sh and jnibuild.sh are in charge of building the Nim code and
 generating the jni bridge from the java code respectively. Finally, the
 ndk-build command from the android ndk tools has to be run to build the binary
-libary which will be installed along the final apk.
+library which will be installed along the final apk.
 
 All these steps are wrapped in the ant build script through the customization
 of the -post-compile rule. If you have the android ndk tools installed and you

examples/cross_calculator/ios/src/NRViewController.m

@@ -55,7 +55,7 @@
 	[self.bText resignFirstResponder];
 }
 
-/** Custom loadView method for backwards compatiblity.
+/** Custom loadView method for backwards compatibility.
  * Unfortunately I've been unable to coerce Xcode 4.4 to generate nib files
  * which are compatible with my trusty iOS 3.0 ipod touch so in order to be
  * fully compatible for all devices we have to build the interface manually in

examples/cross_todo/nim_backend/backend.nim

@@ -91,7 +91,7 @@ proc update*(todo: var TTodo; conn: TDbConn): bool =
   ##
   ## Use this method if you (or another entity) have modified the database and
   ## want to update the object you have with whatever the database has stored.
-  ## Returns true if the update suceeded, or false if the object was not found
+  ## Returns true if the update succeeded, or false if the object was not found
   ## in the database any more, in which case you should probably get rid of the
   ## TTodo object.
   assert(todo.id >= 0, "The identifier of the todo entry can't be negative")