doc/lua-filters: use full field name in example (#8857)

Remove old `.c` alias that mimics the JSON representation:
- Since 2.15ish, the lua structure no longer closely resembles that
  JSON representation
- even if it did, introductory examples should be explicit. Using
  an undocumented alias creates ambiguity.

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index fff67fcd8..8f131c2a0 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -42,7 +42,7 @@ to small caps:
 return {
   {
     Strong = function (elem)
-      return pandoc.SmallCaps(elem.c)
+      return pandoc.SmallCaps(elem.content)
     end,
   }
 }
@@ -52,7 +52,7 @@ or equivalently,
 
 ``` lua
 function Strong(elem)
-  return pandoc.SmallCaps(elem.c)
+  return pandoc.SmallCaps(elem.content)
 end
 ```