Fix WebAssembly spec_url values w/ broken fragment (#5537)
Fix WebAssembly spec_url values w/ broken fragment (#5537)

* Fix WebAssembly spec_url values w/ broken fragment

This change fixes the data for several WebAssembly features that had
spec_url values with broken fragment IDs.

* Fix more broken WebAssembly spec URLs, rationalize

chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data