pcase documentation missing

[Andy Moreton]

Using "C-h f pcase" in the master branch only displays the docstring
from the pcase macro, but omits the documentation of the pcase
extensions defined with pcase-defmacro.

Evaluating this shows the extension docs can still be computed:
  (require 'pcase)
  (pcase--make-docstring)

Is this expected ?

    AndyM