Fix typos (#118)

Author: mre

examples/all.rs

@@ -11,7 +11,7 @@ pub mod feature {
 }
 
 error_chain! {
-    // Types generated by the macro. If empty of absent, it defaults to
+    // Types generated by the macro. If empty or absent, it defaults to
     //     Error, ErrorKind, Result;
     types {
         // With custom names:
@@ -20,7 +20,7 @@ error_chain! {
         //     Error, ErrorKind;
     }
 
-    // Automatic bindings to others error types generated by `error_chain!`.
+    // Automatic bindings to other error types generated by `error_chain!`.
     links {
         Inner(inner::Error, inner::ErrorKind);
         // Attributes can be added at the end of the declaration.