[libcxxabi] [llvm] Update stale comments of the demangler, NFC (PR #91740)

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git-clang-format --diff 2d4acb086541577ac6ab3a140b9ceb9659ce7094 dfb22c376fffe838b9f35f2f23f32d9cfbc94b88 -- libcxxabi/src/demangle/ItaniumDemangle.h llvm/include/llvm/Demangle/ItaniumDemangle.h
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View the diff from clang-format here.
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diff --git a/libcxxabi/src/demangle/ItaniumDemangle.h b/libcxxabi/src/demangle/ItaniumDemangle.h
index 36bf454636..2bcbbbd779 100644
--- a/libcxxabi/src/demangle/ItaniumDemangle.h
+++ b/libcxxabi/src/demangle/ItaniumDemangle.h
@@ -5715,7 +5715,8 @@ Node *AbstractManglingParser<Derived, Alloc>::parseTemplateParam() {
 }
 
 // <template-param-decl> ::= Ty                          # type parameter
-//                       ::= Tk <concept name> [<template-args>] # constrained type parameter
+//                       ::= Tk <concept name> [<template-args>] # constrained
+//                       type parameter
 //                       ::= Tn <type>                   # non-type parameter
 //                       ::= Tt <template-param-decl>* E # template parameter
 //                       ::= Tp <template-param-decl>    # parameter pack
diff --git a/llvm/include/llvm/Demangle/ItaniumDemangle.h b/llvm/include/llvm/Demangle/ItaniumDemangle.h
index e7c008be32..a9995b7c49 100644
--- a/llvm/include/llvm/Demangle/ItaniumDemangle.h
+++ b/llvm/include/llvm/Demangle/ItaniumDemangle.h
@@ -5714,7 +5714,8 @@ Node *AbstractManglingParser<Derived, Alloc>::parseTemplateParam() {
 }
 
 // <template-param-decl> ::= Ty                          # type parameter
-//                       ::= Tk <concept name> [<template-args>] # constrained type parameter
+//                       ::= Tk <concept name> [<template-args>] # constrained
+//                       type parameter
 //                       ::= Tn <type>                   # non-type parameter
 //                       ::= Tt <template-param-decl>* E # template parameter
 //                       ::= Tp <template-param-decl>    # parameter pack

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https://github.com/llvm/llvm-project/pull/91740