Fix API docs issues (#1289)

Fix warnings output by YARD to fix the API docs.
Updated renamed parameters.

[skip changeset]
[skip review]
[skip ci]

lib/appsignal/check_in.rb

@@ -22,7 +22,7 @@ class << self
       #     # your code
       #   end
       #
-      # @param name [String] name of the cron check-in to report.
+      # @param identifier [String] identifier of the cron check-in to report.
       # @yield the block to monitor.
       # @return [void]
       # @since 3.13.0

lib/appsignal/config.rb

@@ -214,14 +214,12 @@ def self.determine_root_path
     # Initialize a new configuration object for AppSignal.
     #
     # @param root_path [String] Root path of the app.
-    # @param initial_env [String] The environment to load when AppSignal is started. It
+    # @param env [String] The environment to load when AppSignal is started. It
     #   will look for an environment with this name in the `config/appsignal.yml`
     #   config file.
     # @param logger [Logger] The logger to use for the AppSignal gem. This is
     #   used by the configuration class only. Default:
     #   {Appsignal.internal_logger}. See also {Appsignal.start}.
-    # @param config_file [String] Custom config file location. Default
-    #   `config/appsignal.yml`.
     #
     # @api private
     # @see https://docs.appsignal.com/ruby/configuration/