Updated the changelog, commands, and hooks docs to be clearer

doc/pages/changelog.asciidoc

@@ -19,8 +19,8 @@ released versions.
   `requires-module` commands that allows for lazily loading language
   support files with dependency resolution.
 
-* Added a new hook `ModuleLoad` which is run when a module is loaded, as
-  now options needed by modules aren't defined until the module is loaded.
+* Added a new hook `ModuleLoad` which is run when a module is loaded,
+  allowing for module specific configuration.
 
 == Kakoune 2019.01.20
 

doc/pages/commands.asciidoc

@@ -315,11 +315,17 @@ but not really useful in that context.
 == Module commands
 
 *provide-module* [<switches>] <name> <commands>::
-    declares a new module that is provided by the given commands. The commands
-    passed into the module are guaranteed to be run only once.
+    declares a module *name* that is defined by *commands*. *commands* will be
+    evaluated as if by source the first time *require-module <name>* is run.
+
+*-override*:::
+    allow the module to replace and existing one with the same name
 
 *require-module* <name>::
-    guarantees the <name> module is loaded before continuing command execution
+    guarantees the commands associated with *name* have been evaluated before
+    continuing command execution. Fails if *name* has not been defined by a
+    *provide-module* command. Does nothing if the associated commands have
+    already been evaluated.
 
 == Multiple commands
 

doc/pages/hooks.asciidoc

@@ -181,7 +181,7 @@ name. Hooks with no description will always use an empty string.
     Triggered whenever a key is pressed by the user
 
 *ModuleLoad* `module`::
-    Triggered when a module is loaded
+    Triggered when a module is evaluated by the first `require-module` call
 
 Note that some hooks will not consider underlying scopes depending on what
 context they are bound to be run into, e.g. the `BufWritePost` hook is a buffer