Fix description of eval

Author: fkohrt

src/resources/schema/cell-codeoutput.yml

@@ -11,8 +11,8 @@
 
       - `true` (default): evaluate code cell
       - `false`: don't evaluate code cell
-      - `[...]`: A list of positive or negative line numbers to selectively include or exclude lines 
-        (explicit inclusion/excusion of lines is available only when using the knitr engine)
+      - `[...]`: A list of positive or negative numbers to selectively include or exclude expressions 
+        (explicit inclusion/excusion of expressions is available only when using the knitr engine)
 
 - name: echo
   tags: