fix link

Author: RexJaeschke

standard/interfaces.md

@@ -618,7 +618,7 @@ It is an error to declare a class type, struct type, or enum type within the sco
 
 ### 18.4.6 Interface member access
 
-Interface members are accessed through member access ([§12.8.7](expressions.md#1287-member-access)) and indexer access ([§12.8.12.3](expressions.md#128112-indexer-access)) expressions of the form `I.M` and `I[A]`, where `I` is an interface type, `M` is a constant, field, method, property, or event of that interface type, and `A` is an indexer argument list.
+Interface members are accessed through member access ([§12.8.7](expressions.md#1287-member-access)) and indexer access ([§12.8.12.3](expressions.md#128123-indexer-access)) expressions of the form `I.M` and `I[A]`, where `I` is an interface type, `M` is a constant, field, method, property, or event of that interface type, and `A` is an indexer argument list.
 
 For interfaces that are strictly single-inheritance (each interface in the inheritance chain has exactly zero or one direct base interface), the effects of the member lookup ([§12.5](expressions.md#125-member-lookup)), method invocation ([§12.8.10.2](expressions.md#128102-method-invocations)), and indexer access ([§12.8.12.3](expressions.md#128123-indexer-access)) rules are exactly the same as for classes and structs: More derived members hide less derived members with the same name or signature. However, for multiple-inheritance interfaces, ambiguities can occur when two or more unrelated base interfaces declare members with the same name or signature. This subclause shows several examples, some of which lead to ambiguities and others which don’t. In all cases, explicit casts can be used to resolve the ambiguities.