docs: document @keyword.control.exception scope

As identified in [this GitHub comment](#1433 (comment))
helix-editor · Jan 4, 2022 · 4cc7fb1 · 4cc7fb1
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commit 4cc7fb1
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diff --git a/book/src/themes.md b/book/src/themes.md
@@ -147,6 +147,7 @@ We use a similar set of scopes as
     - `repeat` - `for`, `while`, `loop`
     - `import` - `import`, `export`
     - `return`
+    - `exception`
   - `operator` - `or`, `in`
   - `directive` - Preprocessor directives (`#if` in C) 
   - `function` - `fn`, `func`