Tweaks "Tiddlers" docs

Thanks for the prompt @FND - I’ve pushed this version to
http://tiddlywiki.com/#Tiddlers and
http://tiddlywiki.com/static/Tiddlers.html

editions/tw5.com/tiddlers/concepts/Tiddlers.tid

@@ -1,9 +1,13 @@
 created: 20130825213500000
-modified: 20140621092710560
+modified: 20141101111732959
 tags: Concepts
 title: Tiddlers
 type: text/vnd.tiddlywiki
 
-Tiddlers are the smallest unit of information in TiddlyWiki. Other systems have analogous concepts with more prosaic names: like "items", "entries", "entities" or "records". Even though "tiddler" is a bit of a preposterous name it has the virtue of being confusingly distinctive rather than confusingly generic.
+Tiddlers are the fundamental units of information in TiddlyWiki. Tiddlers work best when they are as small as possible so that they can be reused by weaving them together different ways.
 
-Internally, tiddlers are an immutable dictionary of name:value pairs called fields. The only field that is required is the `title` field, but useful tiddlers also have a `text` field, and some or all of the standard fields listed in TiddlerFields.
+Other systems have analogous concepts with confusingly generic names: like "items", "entries", "entities", "nodes" or "records". TiddlyWiki takes the view that it is preferable to be confusingly distinctive.
+
+Internally, tiddlers are a list of uniquely named values called fields. The only field that is required is the `title` field, but useful tiddlers also have a `text` field, and some or all of the standard fields listed in TiddlerFields.
+
+Tiddlers are ubiquitous in TiddlyWiki. They are used to store everything from JavaScript code modules to the settings and state associated with the user interface.