Fix typos and improve language

lib/finch/http1/pool_metrics.ex

@@ -6,7 +6,7 @@ defmodule Finch.HTTP1.PoolMetrics do
 
     * `:pool_index` - Index of the pool
     * `:pool_size` - Total number of connections of the pool
-    * `:available_connections` - Number of avaialable connections
+    * `:available_connections` - Number of available connections
     * `:in_use_connections` - Number of connections currently in use
 
   Caveats:

lib/finch/http2/pool.ex

@@ -450,7 +450,7 @@ defmodule Finch.HTTP2.Pool do
     {:keep_state, data}
   end
 
-  # If we're in a read only state than respond with an error immediately
+  # If we're in a read only state then respond with an error immediately
   def connected_read_only({:call, from}, {:request, _, _, _}, _) do
     {:keep_state_and_data, {:reply, from, {:error, Error.exception(:read_only)}}}
   end

lib/finch/pool_manager.ex

@@ -122,7 +122,7 @@ defmodule Finch.PoolManager do
 
   defp maybe_drop_tls_options(config, _), do: config
 
-  # Hostname is required when the address is not a url (binary) so we need to specify
+  # Hostname is required when the address is not a URL (binary) so we need to specify
   # a default value in case the configuration does not specify one.
   defp maybe_add_hostname(config, {_scheme, {:local, _path}, _port} = _shp) when is_map(config) do
     conn_opts =

test/support/finch_case.ex

@@ -18,6 +18,6 @@ defmodule FinchCase do
     {:ok, bypass ++ [finch_name: context.test]}
   end
 
-  @doc "Returns the url for a Bypass instance"
+  @doc "Returns the URL for a Bypass instance"
   def endpoint(%{port: port}, path \\ "/"), do: "http://localhost:#{port}#{path}"
 end