xxx: remove xxx

Remove a couple of links that I didn't go back and fix before committing.

documentation/content/en/articles/committers-guide/_index.adoc

@@ -288,8 +288,7 @@ Both reflect the defaults of git at the time they were created.
 The 'main' branch is the default branch if you omit the '-b branch' or '--branch branch' options below.
 
 ===== Repositories
-XXX cross reference handbook XXX
-Please see [URLs.md] for the latest information on where to get FreeBSD soruces.
+Please see the <<admin,Administrative Details>> for the latest information on where to get FreeBSD soruces.
 $URL below can be obstained from that page.
 
 Note: The project doesn't use submodules as they are a poor fit for our workflows and development model.
@@ -346,9 +345,8 @@ eg:
 ....
 so that won't be covered in depth here.
 
-If you want to build a custom kernel, chapter 8.4 of the FreeBSD Handbook recommends creating a file MYKERNEL under sys/${ARCH}/conf with your changes against GENERIC.
+If you want to build a custom kernel, link:{handbook}#kernelconfig[the kernel config section] of the FreeBSD Handbook recommends creating a file MYKERNEL under sys/${ARCH}/conf with your changes against GENERIC.
 To have MYKERNEL disregarded by git, it can be added to .git/info/exclude.
-XXX cross reference handbook XXX
 
 ===== Updating