Improve introduction of modules and imports

Thanks @RyanBrewer317!

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+<p>
+  In Gleam strings are written as text surrounded by double quotes, and
+  can span multiple lines and contain unicode characters.
+</p>
+<p>
+  The <code>&lt;&gt;</code> operator can be used to concatenate strings.
+</p>
+<p>
+  Several escape sequences are supported:
+</p>
+<ul>
+  <li><code>\"</code> - double quote</li>
+  <li><code>\\</code> - backslash</li>
+  <li><code>\f</code> - form feed</li>
+  <li><code>\n</code> - newline</li>
+  <li><code>\r</code> - carriage return</li>
+  <li><code>\t</code> - tab</li>
+  <li><code>\u{xxxxxx}</code> - unicode codepoint</li>
+</ul>
+<p>
+  The <a href="https://hexdocs.pm/gleam_stdlib/gleam/string.html"><code>gleam/string</code></a>
+  standard library module contains functions for working with strings.
+</p>