Fix pkg name (#639)

namespace.Rmd

@@ -292,7 +292,7 @@ To use classes defined in another package, place `@importClassesFrom package Cla
 
 To use generics defined in another package, place `@importMethodsFrom package GenericA GenericB ...` next to the methods that use the imported generics.
 
-Since S4 is implemented in the methods package, you need to make sure it's available. This is easy to overlook because while the method package is always available in the search path when you're working interactively, it's not automatically loaded by `Rscript`, the tool often used to run R from the command line.
+Since S4 is implemented in the methods package, you need to make sure it's available. This is easy to overlook because while the methods package is always available in the search path when you're working interactively, it's not automatically loaded by `Rscript`, the tool often used to run R from the command line.
 
   * Pre R 3.2.0: `Depends: methods` in `DESCRIPTION`.  \
     Post R 3.2.0: `Imports: methods` in `DESCRIPTION`.