boxed-str: add subtitle about rust-lldb

_layouts/post.html

@@ -6,7 +6,7 @@ layout: default
   <div class="post-header">
     <h1 class="post-title">{{ page.title | markdownify }}</h1>
     {% if page.subtitle %}
-    <h2 class="post-subtitle">{{ page.subtitle }}</h1>
+    <h2 class="post-subtitle">{{ page.subtitle | markdownify }}</h1>
     {% endif %}
     <p class="post-meta">
       <span>{{ page.date | date: "%b %-d, %Y" }}</span>

_posts/2022-06-16-rust-boxed-str-vs-string.md

@@ -1,6 +1,7 @@
 ---
 layout: post
 title: "What is `Box<str>` and how is it different from `String` in Rust?"
+subtitle: Using `rust-lldb` to understand rust memory internals
 date: 2022-06-16 00:00:00
 permalink: rust-box-str-vs-string/
 categories: programming