Fixes + sign formatting

Author: ikwattro

modules/ROOT/pages/deprecations-additions-removals-compatibility.adoc

@@ -98,7 +98,7 @@ label:deprecated[]
 ----
 ... + n:A&B\|C
 ----
-a| Using an unparenthesized label expression predicate as the right-hand side operand of `+` is deprecated.
+a| Using an unparenthesized label expression predicate as the right-hand side operand of `\+` is deprecated.
 Parenthesize the label expression predicate on the right-hand side of `+`: `... + (n:A)`.
 
 a|