Fix cross-references

Author: stevepiercy

docs/backend/upgrading/version-specific-migration/upgrade-to-61.md

@@ -123,7 +123,7 @@ If you have an existing Plone 5.2 or 6.0 site and you migrate to 6.1, then migra
 
 Plone 6.1 introduces the concept of a Plone {term}`distribution`.
 A Plone distribution is a Python package that defines specific features, themes, add-ons, and configurations that get activated when creating a Plone site.
-Now it is available in core Plone as the recommended way for {doc}`creating a new Plone site </install/add-site>`.
+Now it is available in core Plone as the recommended way for {doc}`creating a new Plone site </admin-guide/add-site>`.
 
 ```{seealso}
 For more information about distribution concepts, see {doc}`/conceptual-guides/distributions`.

docs/conceptual-guides/make-build-backend-walk-through.md

@@ -52,7 +52,7 @@ The command `make build-backend`:
 
 -   Returning to the target `build-dev`:
 
-    -   This generates the `mxdev` files as described above in {ref}`mxdev-usage-overview-label`.
+    -   This generates the `mxdev` files as described above in {ref}`manage-backend-python-packages-label`.
     -   Installs Plone core packages and add-ons from the files generated by `mxdev`.
 
 You can configure your Zope instance as described in the section {doc}`/admin-guide/configure-zope`.