cleanup, docs

site/doc/pages/base64_encode.txt

@@ -16,12 +16,7 @@ UCE strings can contain binary data, so `raw` may include NUL bytes and non-text
 
 Example:
 
-```uce
-String encoded = base64_encode("hello");
-// encoded == "aGVsbG8="
-```
 
-Related:
 
-- PHP: `base64_encode()`
-- JavaScript / Node.js: `Buffer.from(value).toString("base64")`
+:example
+print(base64_encode("hello"), "\n");