Fixup doc version and typo (#211)

instrumentation/opentelemetry_tesla/README.md

@@ -11,7 +11,7 @@ by adding `opentelemetry_tesla` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:opentelemetry_tesla, "~> 2.1.0"}
+    {:opentelemetry_tesla, "~> 2.2.0"}
   ]
 end
 ```

instrumentation/opentelemetry_tesla/lib/middleware/opentelemetry_tesla_middleware.ex

@@ -4,7 +4,7 @@ defmodule Tesla.Middleware.OpenTelemetry do
 
   When used with `Tesla.Middleware.PathParams`, the span name will be created
   based on the provided path. Without it, the span name follow OpenTelemetry
-  standards and use just the method name, if not being overriden by opts.
+  standards and use just the method name, if not being overridden by opts.
 
   NOTE: This middleware needs to come before `Tesla.Middleware.PathParams`