docs/manual: fix typo

Also remove dangling reference to virtual package lists.

Signed-off-by: Lucile Quirion <lucile.quirion@savoirfairelinux.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/manual/adding-packages-directory.txt

@@ -384,9 +384,6 @@ openGL libraries.
 
 See xref:virtual-package-tutorial[] for more on the virtual packages.
 
-See xref:virtual-package-list[] for the symbols to depend on if your package
-depends on a feature provided by a virtual package.
-
 === The +.mk+ file
 
 [[adding-packages-mk]]

docs/manual/customize-outside-br.txt

@@ -178,7 +178,7 @@ the br2-external tree. Buildroot will automatically show them in the
 output of +make list-defconfigs+ and allow them to be loaded with the
 normal +make <name>_defconfig+ command. They will be visible in the
 'make list-defconfigs' output, below an +External configs+ label that
-contains the name of the br2-extermnal tree they are defined in.
+contains the name of the br2-external tree they are defined in.
 
 .Note:
 If a defconfig file is present in more than one br2-external tree, then