fix(terraform_docs) Add missing popd to code that was introduced in v…

…1.95.0

A bug in the terraform-docs hook was introduced by the code changes in #717.  [A continue statement was added that is not preceded by a `popd` command](https://github.com/antonbabenko/pre-commit-terraform/blob/869a106a4c8c48f34f58318a830436142e31e10a/hooks/terraform_docs.sh#L216).  The bug is only triggered when the hook is processing multiple files where one (or more) of the files does not contain the terraform-docs marker statements.  The hook fails to process the remaining files because the working directory is not reset to the root of the repository.

hooks/terraform_docs.sh

@@ -213,7 +213,7 @@ function terraform_docs {
     #
     if [[ $add_to_existing == false ]]; then
       have_marker=$(grep -o "$insertion_marker_begin" "$output_file") || unset have_marker
-      [[ ! $have_marker ]] && continue
+      [[ ! $have_marker ]] && popd > /dev/null && continue
     fi
     # shellcheck disable=SC2086
     terraform-docs --output-mode="$output_mode" --output-file="$output_file" $tf_docs_formatter $args ./ > /dev/null