Small tweaks to home page copy

Author: wezm

index.html

@@ -8,7 +8,7 @@ <h1>
     </h1>
 
     <p>
-        Bringing <em>great</em> IDE experience<br>
+        Bringing a <em>great</em> IDE experience<br>
         to the Rust programming language.
     </p>
 
@@ -37,7 +37,7 @@ <h2>Quick Start</h2>
         For VS Code, install <a
             href="https://marketplace.visualstudio.com/items?itemName=matklad.rust-analyzer">rust-analyzer</a> extension
         from the marketplace.
-        Prebuild language server binaries for Windows, Linux and Mac are available on the <a
+        Prebuilt language server binaries for Windows, Linux and Mac are available on the <a
             href="https://github.com/rust-analyzer/rust-analyzer/releases">releases</a> page.
     </p>