Update Nushell documentation (0.85.0)

Author: simon04

lib/docs/filters/nushell/clean_html.rb

@@ -3,6 +3,7 @@ module Docs
   class Nushell
     class CleanHtmlFilter < Filter
       def call
+        @doc = at_css('.theme-default-content > div:only-child', '.theme-default-content')
         css('footer').remove
         css('h1 a, h2 a').remove
         doc

lib/docs/scrapers/nushell.rb

@@ -6,7 +6,7 @@ class Nushell < UrlScraper
     self.name = "Nushell"
     self.slug = "nushell"
     self.type = "nushell"
-    self.release = "0.84.0"
+    self.release = "0.85.0"
     self.links = {
       home: "https://www.nushell.sh/",
       code: "https://github.com/nushell/nushell",
@@ -18,13 +18,12 @@ class Nushell < UrlScraper
     options[:follow_links] = true
     options[:title] = "Nushell"
     options[:attribution] = <<-HTML
-      Copyright &copy; 2019 - 2023 The Nushell Project Developers
+      Copyright &copy; 2019–2023 The Nushell Project Developers
       Licensed under the MIT License.
     HTML
 
     # latest version has a special URL that does not include the version identifier
     version do
-      self.release = "0.84.0"
       self.base_urls = [
         "https://www.nushell.sh/book/",
         "https://www.nushell.sh/commands/"