[gardening] Fix comment block indentation in 3a92443 where clang-format went a little too far.

Author: gottesmm

include/swift/SILOptimizer/Analysis/AliasAnalysis.h

@@ -22,13 +22,14 @@
 using swift::RetainObserveKind;
 
 namespace {
-/// A key used for the AliasAnalysis cache.
-///
-/// This struct represents the argument list to the method 'alias'.  The two
-/// SILValue pointers are mapped to size_t indices because we need an
-/// efficient way to invalidate them (the mechanism is described below). The
-/// Type arguments are translated to void* because their underlying storage is
-/// opaque pointers that never goes away.
+
+  /// A key used for the AliasAnalysis cache.
+  ///
+  /// This struct represents the argument list to the method 'alias'.  The two
+  /// SILValue pointers are mapped to size_t indices because we need an
+  /// efficient way to invalidate them (the mechanism is described below). The
+  /// Type arguments are translated to void* because their underlying storage is
+  /// opaque pointers that never goes away.
   struct AliasKeyTy {
     // The SILValue pair:
     size_t V1, V2;