last stdlib cleanups

lib/pure/collections/rtarrays.nim

@@ -10,6 +10,8 @@
 
 ## Module that implements a fixed length array whose size
 ## is determined at runtime. Note: This is not ready for other people to use!
+##
+## Unstable API.
 
 const
   ArrayPartSize = 10

lib/pure/collections/sharedlist.nim

@@ -8,6 +8,8 @@
 #
 
 ## Shared list support.
+##
+## Unstable API.
 
 {.push stackTrace: off.}
 

lib/pure/collections/sharedtables.nim

@@ -11,6 +11,8 @@
 ## you'll be in trouble. Uses a single lock to protect the table, lockfree
 ## implementations welcome but if lock contention is so high that you need a
 ## lockfree hash table, you're doing it wrong.
+##
+## Unstable API.
 
 import
   hashes, math, locks