Fix r177 appcast HTML to link to vim pull request from marker

Author: ychin

_includes/releases/r177.html

@@ -30,7 +30,7 @@ <h2 id="updater--whats-new-page">Updater / What’s New page</h2>
 <h2 id="new-vim-features">New Vim features</h2>
 
 <ul>
-  <li>New bundled colorschemes: wildcharm/retrobox/sorbet/zaibatsu (vim/vim#12163)</li>
+  <li>New bundled colorschemes: wildcharm/retrobox/sorbet/zaibatsu (<a href="https://github.com/vim/vim/pull/12163">vim/vim#12163</a>)</li>
   <li>File encryption now has a new <code>cryptmethod</code>: <code>xchacha20v2</code>, which is designed to be more forward compatible with future Vim versions than <code>xchacha20</code>.  (<a href="https://github.com/vim/vim/commit/aae583441bcdbb0bfef3b8a1d193e04ae09ca95d">v9.0.1481</a>)</li>
   <li><code>switchbuf</code> works for more commands. (<a href="https://github.com/vim/vim/commit/54be5fb382d2bf25fd1b17ddab8b21f599019b81">v9.0.1546</a>)</li>
   <li>Statusline now supports multiple alignment “%=” items. (<a href="https://github.com/vim/vim/commit/3ec78f973fdaec2cea8e036ed38037b2fe40670b">v9.0.1300</a>)</li>