Fix broken link in spec (#635)

* Fail build for internal broken links

* Fix broken link

spec/pom.xml

@@ -27,4 +27,20 @@
     <packaging>pom</packaging>
     <name>MicroProfile Fault Tolerance Specification</name>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.asciidoctor</groupId>
+                <artifactId>asciidoctor-maven-plugin</artifactId>
+                <configuration>
+                    <logHandler>
+                        <failIf>
+                            <severity>INFO</severity> <!-- Fail on invalid internal references -->
+                        </failIf>
+                    </logHandler>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
 </project>

spec/src/main/asciidoc/release_notes.asciidoc

@@ -33,7 +33,7 @@ No.
 - Work with MicroProfile Telemetry Metrics (link:https://github.com/eclipse/microprofile-fault-tolerance/issues/622[#622])
 
 === Other Changes
-- Removed use of unmanaged threads in TCK (link:https://github.com/eclipse/microprofile-fault-tolerance/issues/634[#634])
+- Removed unmanaged threads in TCK (link:https://github.com/eclipse/microprofile-fault-tolerance/issues/634[#634])
 
 [[release_notes_40]]
 == Release Notes for MicroProfile Fault Tolerance 4.0
@@ -69,7 +69,7 @@ In addition, metrics have moved from the `application:` scope to the `base:` sco
 Old metric:: `application:ft.<name>.timeout.callsTimedOut.total`
 New metric:: `base:ft.timeout.calls.total{method="<name>", timedOut="true"}`
 
-These changes mean that existing dashboards and queries which use metrics provided by MicroProfile Fault Tolerance will need to be updated to use the new metrics listed in <<Integration with MicroProfile Metrics>>.
+These changes mean that existing dashboards and queries which use metrics provided by MicroProfile Fault Tolerance will need to be updated to use the new metrics listed in <<Integration with MicroProfile Metrics and MicroProfile Telemetry>>.
 
 ==== Lifecycle of circuit breakers and bulkheads is now specified