fix links and anchors

Author: BillWagner

standard/classes.md

@@ -3269,7 +3269,7 @@ If an optional partial method has no implementation, any expression statement in
 
 If a defining declaration but not an implementing declaration is given for an optional partial method `M`, the following restrictions apply:
 
-- It is a compile-time error to create a delegate from `M` ([§12.8.17.5](expressions.md#128175-delegate-creation-expressions)).
+- It is a compile-time error to create a delegate from `M` ([§12.8.17.6](expressions.md#128176-delegate-creation-expressions)).
 - It is a compile-time error to refer to `M` inside an anonymous function that is converted to an expression tree type ([§8.6](types.md#86-expression-tree-types)).
 - Expressions occurring as part of an invocation of `M` do not affect the definite assignment state ([§9.4](variables.md#94-definite-assignment)), which can potentially lead to compile-time errors.
 - `M` cannot be the entry point for an application ([§7.1](basic-concepts.md#71-application-startup)).

standard/conversions.md

@@ -325,7 +325,7 @@ An implicit constant expression conversion permits the following conversions:
 - A *constant_expression* ([§12.26](expressions.md#1226-constant-expressions)) of type `int` can be converted to type `sbyte`, `byte`, `short`, `ushort`, `uint`, `nuint`, or `ulong`, provided the value of the *constant_expression* is within the range of the destination type.
 - A *constant_expression* of type `long` can be converted to type `ulong`, provided the value of the *constant_expression* is not negative.
 
-The range for constants of type `nint` is the same range as `int`, and the range for constants of type `nuint` is the same range as `uint` ([§12.25](expressions.md#1225-constant-expressions)).
+The range for constants of type `nint` is the same range as `int`, and the range for constants of type `nuint` is the same range as `uint` ([§12.26](expressions.md#1226-constant-expressions)).
 
 > *Note*: This is a consequence of `nint`/`nuint` being the same size as, or larger than, `int`/`uint` ([§8.3.6](types.md#836-integral-types)). *end note*