Remove vestigial '====' heading syntax

https://github.com/QubesOS/qubes-issues/issues/6701#issuecomment-862060759

developer/system/architecture.md

@@ -11,7 +11,6 @@ ref: 56
 title: Architecture
 ---
 
-===========================
 
 Qubes implements a Security by Isolation approach. To do this, Qubes utilizes virtualization technology in order to isolate various programs from each other and even to sandbox many system-level components, such as networking and storage subsystems, so that the compromise of any of these programs or components does not affect the integrity of the rest of the system.
 

developer/system/audio.md

@@ -7,7 +7,6 @@ ref: 60
 title: Audio Virtualization
 ---
 
-====================
 
 VMs on Qubes OS have access to virtualized audio through the PulseAudio module.
 It consists of two parts:

developer/system/gui.md

@@ -11,7 +11,6 @@ ref: 61
 title: GUI
 ---
 
-==================
 
 qubes_gui and qubes_guid processes
 ------------------------------------

developer/system/security-critical-code.md

@@ -11,7 +11,6 @@ ref: 55
 title: Security-critical Code
 ---
 
-==================================
 
 Below is a list of security-critical (i.e., trusted) code components in Qubes OS.
 A successful attack against any of these components could compromise the system's security.

developer/system/storage-pools.md

@@ -7,7 +7,6 @@ ref: 57
 title: Storage Pools
 ---
 
-======================
 
 Qubes OS R3.2 introduced the concept of storage drivers and pools.  This feature
 was a first step towards a saner storage API, which is heavily rewritten in R4.