Fix more spelling mistakes

Author: hadley

DESCRIPTION

@@ -3,7 +3,7 @@ Title: Easily tidy data with spread and gather functions.
 Version: 0.1
 Authors@R: 'Hadley Wickham <[email protected]> [aut,cre]'
 Description: tidyr is an evolution of reshape2. It's design specifically for
-    data tidying (not general reshaping or aggregrating) and works well with
+    data tidying (not general reshaping or aggregating) and works well with
     dplyr data pipelines.
 Depends:
     R (>= 3.1.0)
@@ -12,7 +12,7 @@ LazyData: true
 Imports:
     reshape2,
     dplyr (>= 0.2)
-Url: https://github.com/hadley/tidyr
+URL: https://github.com/hadley/tidyr
 Suggests:
     knitr,
     testthat