[AbstractCallSite] Fix some doxygen comments I failed to update when ImmutableCallSite was replaced with CallBase.

Also fix an 80 column violation.
diff --git a/llvm/lib/IR/AbstractCallSite.cpp b/llvm/lib/IR/AbstractCallSite.cpp
index 0354e7d..ab5551a 100644
--- a/llvm/lib/IR/AbstractCallSite.cpp
+++ b/llvm/lib/IR/AbstractCallSite.cpp
@@ -33,8 +33,8 @@
 STATISTIC(NumInvalidAbstractCallSitesNoCallback,
           "Number of invalid abstract call sites created (no callback)");
 
-void AbstractCallSite::getCallbackUses(const CallBase &CB,
-                                       SmallVectorImpl<const Use *> &CallbackUses) {
+void AbstractCallSite::getCallbackUses(
+    const CallBase &CB, SmallVectorImpl<const Use *> &CallbackUses) {
   const Function *Callee = CB.getCalledFunction();
   if (!Callee)
     return;