Fix classes.tuple tests and assocs help lint

basis/tools/memory/memory.factor

@@ -242,6 +242,8 @@ M: code-blocks nth-unsafe
     [ cache>> ] [ blocks>> ] bi
     '[ _ nth-unsafe <code-block> ] cache ; inline
 
+M: code-blocks hashcode* 2drop 0 ;
+
 INSTANCE: code-blocks immutable-sequence
 
 : code-blocks ( -- blocks )

core/assocs/assocs-docs.factor

@@ -361,9 +361,9 @@ HELP: assoc-diff
 ;
 
 HELP: assoc-diff!
-{ $values { "assoc1" assoc } { "assoc2" assoc } { "diff" "a new assoc" } }
+{ $values { "assoc1" assoc } { "assoc2" assoc } }
 { $description "Removes all entries from " { $snippet "assoc1" } " whose key is contained in " { $snippet "assoc2" } "." }
-{ $side-effects assoc-diff! } ;
+{ $side-effects "assoc1" } ;
 
 HELP: substitute
 { $values { "seq" sequence } { "assoc" assoc } { "newseq" sequence } }