Fixup some typos

vignettes/cpp11.Rmd

@@ -1104,9 +1104,9 @@ There are several benefits of moving code from a stand-alone C++ source file to
 
 To add `cpp11` to an existing package first put your C++ files in the `src/` directory of your package. 
 
-Then the easiest way to configure everything is to call `usethis::use_cpp()`. Alternatively:
+Then the easiest way to configure everything is to call `usethis::use_cpp11()`. Alternatively:
 
-* The this to your `DESCRIPTION` file:
+* Add this to your `DESCRIPTION` file:
 
     ```yaml
     LinkingTo: cpp11
@@ -1120,7 +1120,7 @@ Then the easiest way to configure everything is to call `usethis::use_cpp()`. Al
 
 * You'll then need to run [`devtools::document()`](https://devtools.r-lib.org/reference/document.html) to update your `NAMESPACE` file to include the `useDynLib` statement.
 
-If you don't use `devtools::load_all()`, you'll also need to run `cpp11::cpp_register()` before building the package.. 
+If you don't use `devtools::load_all()`, you'll also need to run `cpp11::cpp_register()` before building the package.
 This function scans the C++ files for `[[cpp11::register]]` attributes and generates the binding code required to make the functions available in R.
 Re-run `cpp11::cpp_register()` whenever functions are added, removed, or have their signatures changed.