Thanks @JMichaelTX - I was just about to do that but see that @ccstone has gone ahead and made the changes to the Wiki.
The most confusing part in the Wiki before was the use of the word "name" in different parts of the explanation rather than "key". This is what gave me a headache the first time when I tried to read the explanation.
It was also confusing having the recall example straight away use a variable (which hadn't been referred to before). Not to mention the recall example being about people (who by coincidence also had "names")... rather than coffee prices...
Once the % symbols and [ and , are understood the final syntax is actually not that hard.
Also good to show that each Value has its own "Set Dictionary" Action - very similar to Setting a Variable.
And as a footnote I see that the AppleScript for setting Dictionaries has now been corrected: