docs: fix typos and grammar

Author: dnmvisser

README.md

@@ -57,16 +57,16 @@ configure and run such a proxy instance please visit [Single Service
 Provider<->Multiple Identity providers](doc/one-to-many.md)
 
 If an identity provider can not communicate with service providers in for
-example a federation the can convert request and make the communication
+example a federation, they can convert requests and make the communication
 possible.
 
 
 ## SAML2<->Social logins
 
 This setup makes it possible to connect a SAML2 service provider to multiple
 social media identity providers such as Google and Facebook. The proxy makes it
-possible to mirror a identity provider by generating SAML2 metadata
-corresponding that provider and create dynamic endpoint which are connected to
+possible to mirror an identity provider by generating SAML2 metadata
+corresponding to that provider and create dynamic endpoints which are connected to
 a single identity provider.
 
 For more information about how to set up, configure and run such a proxy