add new lines around sentence on environment availability (github#20296)

data/reusables/gated-features/environments.md

@@ -1 +1 @@
-{% data reusables.gated-features.actions-shared %} Environments, environment protection rules, and environment secrets are available in public repositories for all products and in private repositories for {% data variables.product.prodname_enterprise %}. {% ifversion fpt %}{% data reusables.gated-features.more-info %}{% endif %}
+Environments, environment protection rules, and environment secrets are available in **public** repositories for all products. For access to environments in **private** repositories, you must use {% data variables.product.prodname_enterprise %}.{% ifversion fpt %} {% data reusables.gated-features.more-info %}{% endif %}