minor formatting changes

Author: egoodwinx

spec/Appendix C -- Grammar Summary.md

@@ -320,8 +320,8 @@ Directives[Const]?
 
 FieldExtension :
 
-- extend field MemberCoordinate Directives[const]?
-- extend field description MemberCoordinate
+- extend field MemberCoordinate Directives[Const]
+- extend field Description MemberCoordinate
 
 ArgumentsDefinition : ( InputValueDefinition+ )
 
@@ -333,7 +333,7 @@ InterfaceTypeDefinition :
   FieldsDefinition
 - Description? interface Name ImplementsInterfaces? Directives[Const]?
   [lookahead != `{`]
-  
+
 InterfaceTypeExtension :
 
 - extend interface Name ImplementsInterfaces? Directives[Const]?

spec/Section 3 -- Type System.md

@@ -1109,8 +1109,8 @@ Object type extensions have the potential to be invalid if incorrectly defined.
 
 FieldExtension :
 
-- extend field MemberCoordinate Directives[const]?
-- extend field description MemberCoordinate
+- extend field MemberCoordinate Directives[Const]
+- extend field Description MemberCoordinate
 
 Field extensions are used to represent a field which has been extended from some
 previously defined field. For example this may be a GraphQL service which is
@@ -1126,7 +1126,8 @@ extend field User.name @deprecated(”Some reason”)
 
 Field validation have the potential to be invalid if incorrectly defined.
 
-1. MemberCoordinate must be resolved to an existing field on a object or interface type.  
+1. MemberCoordinate must be resolved to an existing field on a object or
+   interface type.
 2. Any non-repeatable directives provided must not already apply to the previous
    field.