Fix code in post headings

Author: federicobucchi

_posts/2016-03-30-swift-2.2-new-features.md

@@ -160,7 +160,7 @@ This syntax — affectionately called "tuple splat syntax" — is the a
 
 For more information, see the [Swift Evolution proposal](https://github.com/swiftlang/swift-evolution/blob/master/proposals/0029-remove-implicit-tuple-splat.md) or read the [swift-evolution-announce post](https://lists.swift.org/pipermail/swift-evolution-announce/2016-February/000033.html) detailing the rationale.
 
-### C-style `for` loops are deprecated
+### C-style <code>for</code> loops are deprecated
 
 Even though Swift has several idiomatic loop options, C-style for loops were still part of the language and occasionally used. For example:
 

_posts/2017-3-27-swift-3.1-released.md

@@ -12,7 +12,7 @@ Swift 3.1 is now officially released!  Swift 3.1 is a minor release that contain
 ### Language Updates
 Swift 3.1 is a minor language release.  It is source compatible with Swift 3.0.  It contains the following language changes and updates, most of which went through the Swift [Evolution process](/contributing/#participating-in-the-swift-evolution-process):
 
-#### New `Sequence` protocol members
+#### New <code>`Sequence`</code> protocol members
 
 The `Sequence` protocol now has two new members:
 

_posts/2023-09-28-whats-new-swift-debugging-5.9.md

@@ -13,7 +13,7 @@ Swift 5.9 introduced a number of new debugging features to the compiler and [LLD
 Here are three changes that can help with your everyday debugging workflows.
 
 
-### Faster variable inspection with `p` and `po`
+### Faster variable inspection with <code>p</code> and <code>po</code>
 
 LLDB provides the shorthand `p` command alias to inspect variables and `po` to call the debugDescription property of objects. Originally, these were aliases for the rather heavyweight `expression` and `expression -O` commands. In Swift 5.9, the `p` and `po` command aliases have been redefined to the new [`dwim-print` command](https://reviews.llvm.org/D138315 "LLVM review").