This type of errant apostrophe is not uncommon. Fowler's Modern English Usage notes many such usage. Though it rises some eyebrows but it still appears -
potato's 10p a lb.
video's for rent.
The use of these apostrophe is to make the noun plural, when the noun ends with a vowel. Example - grotto's, opera's, toga's etc.
This use is often called the greengrocers' (or grocers') apostrophe because of the frequency with which plural forms such as apple's, cauli's, orange's etc appear in their shops.
But your question is somewhat different to what I have written so far. I wrote it to introduce such use of apostrophe.
Now coming back to your question.
Butcher is actually a person who sells meat or cuts meat for that purpose.
A butcher's is generally used to mean a shop where meat is sold.
A fishmonger is a person who sells fish. So the shop where he sells fish is called fishmonger's. But that is actually a old use. People now prefer to write a fish shop.
Bakery can only refer to a shop where bread is baked. But it's rarely used for shop. The baker's is the usual phrase.
Grocery doesn't refer to a shop in BrE, though it does in AmE. As for butchery, confectionery, jewellery, stationery, haberdashery, they can never refer to a shop in either language. A genitive has to be used to refer to a shop.
These genitives have two plurals when used with 'shop'.
Several butcher's shop or several butchers' shops. The second phrase is preferable. Some people consider it the only correct form.
But several butchers is used by far the most frequently.
The New Fowler's Modern English Usage
Oxford's Advanced Learner's Dictionary
Aspects of Modern English Usage: for advanced students By Paul Lambotte, Harry Campbell, J. Potter