message: Update .changeset/happy-crabs-punch.md
diff: '@backstage/config-loader': patch
  ---
  -Added support for environment variable substitutions in string configuration values using a `${VAR}` placeholder. All environment variables much be available, or the entire expression will be evaluated to `undefined`. To escape a substitution, use `$${...}`, which will end up as `${...}`.
  +Added support for environment variable substitutions in string configuration values using a `${VAR}` placeholder. All environment variables must be available, or the entire expression will be evaluated to `undefined`. To escape a substitution, use `$${...}`, which will end up as `${...}`.
  For example:
  