[DOCS] Add impact sections to 8.0 java api breaking changes (#56510)

docs/reference/migration/migrate_8_0/java.asciidoc

@@ -17,15 +17,18 @@ To create `Fuzziness` instances, use the `fromString` and `fromEdits` method
 instead of the `build` method that used to accept both Strings and numeric
 values. Several fuzziness setters on query builders (e.g.
 MatchQueryBuilder#fuzziness) now accept only a `Fuzziness`instance instead of
-an Object. You should preferably use the available constants (e.g.
-Fuzziness.ONE, Fuzziness.AUTO) or build your own instance using the above
-mentioned factory methods.
+an Object.
 
 Fuzziness used to be lenient when it comes to parsing arbitrary numeric values
 while silently truncating them to one of the three allowed edit distances 0, 1
 or 2. This leniency is now removed and the class will throw errors when trying
 to construct an instance with another value (e.g. floats like 1.3 used to get
-accepted but truncated to 1). You should use one of the allowed values.
+accepted but truncated to 1).
+
+*Impact* +
+Use the available constants (e.g. `Fuzziness.ONE`, `Fuzziness.AUTO`) or build
+your own instance using the above mentioned factory methods. Use only allowed
+`Fuzziness` values.
 ====
 
 .Changes to `Repository`.
@@ -35,4 +38,7 @@ accepted but truncated to 1). You should use one of the allowed values.
 Repository has no dependency on IndexShard anymore. The contract of restoreShard
 and snapshotShard has been reduced to Store and MappingService in order to improve
 testability.
+
+*Impact* +
+No action needed.
 ====