Edit 01b-collections.md a bit for md and missing content

1 files changed, 13 insertions, 11 deletions

diff --git a/doc/HACKING/design/01b-collections.md b/doc/HACKING/design/01b-collections.md
index def60b0f15..ed6fdc9071 100644
--- a/doc/HACKING/design/01b-collections.md
+++ b/doc/HACKING/design/01b-collections.md
@@ -4,27 +4,27 @@
 ### Smartlists: Neither lists, nor especially smart.
 
 For historical reasons, we call our dynamic-allocated array type
-"smartlist_t".  It can grow or shrink as elements are added and removed.
+`smartlist_t`.  It can grow or shrink as elements are added and removed.
 
-All smartlists hold an array of void \*.  Whenever you expose a smartlist
+All smartlists hold an array of `void *`.  Whenever you expose a smartlist
 in an API you *must* document which types its pointers actually hold.
 
 <!-- It would be neat to fix that, wouldn't it? -NM  -->
 
-Smartlists are created empty with smartlist_new() and freed with
-smartlist_free().  See the containers.h module documentation for more
+Smartlists are created empty with `smartlist_new()` and freed with
+`smartlist_free()`.  See the `containers.h` module documentation for more
 information; there are many convenience functions for commonly needed
 operations.
 
+<!-- TODO: WRITE more about what you can do with smartlists. -->
 
 ### Digest maps, string maps, and more.
 
 Tor makes frequent use of maps from 160-bit digests, 256-bit digests,
-or nul-terminated strings to void \*. These types are digestmap_t,
-digest256map_t, and strmap_t respectively.  See the containers.h
+or nul-terminated strings to `void *`. These types are `digestmap_t`,
+`digest256map_t`, and `strmap_t` respectively.  See the containers.h
 module documentation for more information.
 
-
 ### Intrusive lists and hashtables
 
 For performance-sensitive cases, we sometimes want to use "intrusive"
@@ -32,12 +32,14 @@ collections: ones where the bookkeeping pointers are stuck inside the
 structures that belong to the collection.  If you've used the
 BSD-style sys/queue.h macros, you'll be familiar with these.
 
-Unfortunately, the sys/queue.h macros vary significantly between the
+Unfortunately, the `sys/queue.h` macros vary significantly between the
 platforms that have them, so we provide our own variants in
-src/ext/tor_queue.h .
+`src/ext/tor_queue.h`.
 
-We also provide an intrusive hashtable implementation in src/ext/ht.h
-. When you're using it, you'll need to define your own hash
+We also provide an intrusive hashtable implementation in `src/ext/ht.h`.
+When you're using it, you'll need to define your own hash
 functions. If attacker-induced collisions are a worry here, use the
 cryptographic siphash24g function to extract hashes.
 
+<!-- TODO: WRITE about bloom filters, namemaps, bit-arrays, order functions.
+-->