Remove unused INSTANCEOF

spec/src/main/asciidoc/ELSpec.adoc

diff --git a/spec/src/main/asciidoc/ELSpec.adoc b/spec/src/main/asciidoc/ELSpec.adoc
index bba00f2..8b3be95 100644
--- a/spec/src/main/asciidoc/ELSpec.adoc
+++ b/spec/src/main/asciidoc/ELSpec.adoc
@@ -2154,7 +2154,6 @@
 |   < OR0 : "||" >
 |   < OR1 : "or" >
 |   < EMPTY : "empty" >
-|   < INSTANCEOF : "instanceof" >
 |   < MULT : "*" >
 |   < PLUS : "+" >
 |   < MINUS : "-" >