docs: Update inline code style (#11378)

This PR updates the inline code style on the docs to match what we use
on zed.dev.

Release Notes:

- N/A

docs/theme/css/general.css

@@ -290,3 +290,8 @@ kbd {
 .result-no-output {
     font-style: italic;
 }
+
+code.hljs {
+    color: rgb(75, 83, 97) !important;
+    background-color: rgba(8, 76, 207, 0.1);
+}