doc string fixes

Author: yaacov

lib/prometheus/api_client.rb

@@ -11,7 +11,7 @@ module ApiClient
     # Create a Prometheus API client:
     #
     # @param [Hash] options
-    # @option options [Hash] :url String base URL.
+    # @option options [String] :url Server base URL.
     # @option options [Hash] :params URI query unencoded key/value pairs.
     # @option options [Hash] :headers Unencoded HTTP header key/value pairs.
     # @option options [Hash] :request Request options.

lib/prometheus/api_client/cadvisor.rb

@@ -11,7 +11,7 @@ module Cadvisor
       # Create a Prometheus API client:
       #
       # @param [Hash] options
-      # @option options [Hash] :url String base URL.
+      # @option options [String] :url Server base URL.
       # @option options [Hash] :params URI query unencoded key/value pairs.
       # @option options [Hash] :headers Unencoded HTTP header key/value pairs.
       # @option options [Hash] :request Request options.

lib/prometheus/api_client/client.rb

@@ -24,15 +24,15 @@ class RequestError < StandardError; end
       # Create a Prometheus API client:
       #
       # @param [Hash] options
-      # @option options [Hash] :url String base URL.
+      # @option options [String] :url server base URL.
       # @option options [Hash] :params URI query unencoded key/value pairs.
       # @option options [Hash] :headers Unencoded HTTP header key/value pairs.
       # @option options [Hash] :request Request options.
       # @option options [Hash] :ssl SSL options.
       # @option options [Hash] :proxy Proxy options.
       #
       # A default client is created if options is omitted.
-      def initialize(options)
+      def initialize(options = {})
         options = DEFAULT_ARGS.merge(options)
 
         @client = Faraday.new(