Align comments vertically

This got incorrectly changed as part of normalizing code listing
indentation in commit 28a4aaf (Bulk replace 3 -> 4 space indents,
2022-10-24).  The first line in each chunk matched the regex and got one
space removed, but the following lines didn't.

References: 28a4aaf

Author: amartini51

TSPL.docc/LanguageGuide/AccessControl.md

@@ -231,25 +231,25 @@ the default access level of the type's members will be internal.
 > and avoids presenting the internal workings of a type as public API by mistake.
 
 ```swift
-public class SomePublicClass {                  // explicitly public class
+public class SomePublicClass {                   // explicitly public class
     public var somePublicProperty = 0            // explicitly public class member
     var someInternalProperty = 0                 // implicitly internal class member
     fileprivate func someFilePrivateMethod() {}  // explicitly file-private class member
     private func somePrivateMethod() {}          // explicitly private class member
 }
 
-class SomeInternalClass {                       // implicitly internal class
+class SomeInternalClass {                        // implicitly internal class
     var someInternalProperty = 0                 // implicitly internal class member
     fileprivate func someFilePrivateMethod() {}  // explicitly file-private class member
     private func somePrivateMethod() {}          // explicitly private class member
 }
 
-fileprivate class SomeFilePrivateClass {        // explicitly file-private class
+fileprivate class SomeFilePrivateClass {         // explicitly file-private class
     func someFilePrivateMethod() {}              // implicitly file-private class member
     private func somePrivateMethod() {}          // explicitly private class member
 }
 
-private class SomePrivateClass {                // explicitly private class
+private class SomePrivateClass {                 // explicitly private class
     func somePrivateMethod() {}                  // implicitly private class member
 }
 ```