message: docs(changelog): fix column name
diff: @@ -8,7 +8,7 @@ Private mutations (differences between a query sequence and nearest neighbour in
  2. (SARS-CoV-2 only for now) Mutation to a genotype common in at least 1 clade get labeled with that clade
  3. Mutations that are neither reversions nor labeled (called "unlabeled")
  -Which category a mutation belongs to is visible by hovering over the "divergence" column (in web) and in various "privateNucMutations" fields in [csv/tsv/json outputs](https://docs.nextstrain.org/projects/nextclade/en/stable/user/output-files.html#tabular-csv-tsv-results).
  +Which category a mutation belongs to is visible by hovering over the "Mut." column in Nextclade Web and in various "privateNucMutations" fields in [csv/tsv/json outputs](https://docs.nextstrain.org/projects/nextclade/en/stable/user/output-files.html#tabular-csv-tsv-results).
  ### [Feature] Insertions now also available as amino acids [#692](https://github.com/nextstrain/nextclade/pull/692)
  