FIX: Documentation for for 0.14.1 change log

Missing code reference in change log documentation
Merge pull request #7769 from bashtage/doc-stata-fix

FIX: Documentation for for 0.14.1 change log
Docs: improve installation instructions, recommend Anaconda.
Merge pull request #7849 from lexual/docs_install_conda_wakari

Docs: improve installation instructions, recommend Anaconda.
BUG: fix multi-column sort that includes Categoricals (GH7848)
CLN: refactor _lexsort_indexer to use Categoricals
BUG: Categorical concat should preserve levels (GH7864)