[clang-doc][NFC] Remove else after return (#136443)

Author: ilovepi

clang-tools-extra/clang-doc/Serialize.cpp

@@ -261,8 +261,7 @@ static bool isPublic(const clang::AccessSpecifier AS,
                      const clang::Linkage Link) {
   if (AS == clang::AccessSpecifier::AS_private)
     return false;
-  else if ((Link == clang::Linkage::Module) ||
-           (Link == clang::Linkage::External))
+  if ((Link == clang::Linkage::Module) || (Link == clang::Linkage::External))
     return true;
   return false; // otherwise, linkage is some form of internal linkage
 }