Merge pull request #497 from redsquirrel/doc-tiny-fixes

Doc tiny fixes

docs/introduction-to-smart-contracts.rst

@@ -122,7 +122,7 @@ get the idea - the compiler figures that out for you.
 .. index:: mapping
 
 The next line, `mapping (address => uint) public balances;` also
-creates a public state variable, but it of a more complex datatype.
+creates a public state variable, but it is a more complex datatype.
 The type maps addresses to unsigned integers.
 Mappings can be seen as hashtables which are
 virtually initialized such that every possible key exists and is mapped to a

docs/solidity-by-example.rst

@@ -199,7 +199,7 @@ activate themselves.
     contract SimpleAuction {
         // Parameters of the auction. Times are either
         // absolute unix timestamps (seconds since 1970-01-01)
-        // ore time periods in seconds.
+        // or time periods in seconds.
         address public beneficiary;
         uint public auctionStart;
         uint public biddingTime;