"When non-nil, provides context for indenting embedded code chunks.
There are languages where part of the code is actually written in
-a sub language, e.g., a Yacc/Bison or ANTLR grammar also consists
-of plain C code. This variable enables the primary mode of the
+a sub language, e.g., a Yacc/Bison or ANTLR grammar can also include
+JS or Python code. This variable enables the primary mode of the
main language to use the indentation engine of the sub-mode for
lines in code chunks written in the sub-mode's language.