Fix the docs for ReadHandle.read's "count"

This was copied over from the old binary handle, and so states we
always return a single number if no count is given. This is only the
case when the file is opened in binary mode.

projects/common/src/main/java/dan200/computercraft/data/PrettyDataProvider.java

@@ -32,7 +32,7 @@ public record PrettyDataProvider<T extends DataProvider>(T provider) implements
     }
 
     private record Output(CachedOutput output) implements CachedOutput {
-        @SuppressWarnings("unused")
+        @SuppressWarnings("deprecation")
         private static final HashFunction HASH_FUNCTION = Hashing.sha1();
 
         @Override