FDP-overview: Fix build output path

PR:             274072
Submitted by:   Graham Perrin <grahamperring@gmail.com>

documentation/content/en/books/fdp-primer/overview/_index.adoc

@@ -143,7 +143,7 @@ To reduce compile time, only one language can be compiled:
 % make DOC_LANG=en
 ....
 +
-The build output is stored in [.filename]#~/documentation/public/articles/# and [.filename]#~/documentation/public/books/#.
+The build output is stored in [.filename]#~/documentation/public/en/articles/# and [.filename]#~/documentation/public/en/books/#.
 +
 . Review the build output and ensure the edits are free from typos, layout problems, or errors. If any errors are found during the build process, edit the problematic files to fix any issues that show up, then run the build command again until all errors are resolved.
 +