docs: fix capitalization and add period consistency for build architecture article (#307)

Author: Ganwtrs

content/articles/ARTICLES.md

@@ -13,4 +13,4 @@ Other articles on assorted topics related to secureblue:
 - [User namespaces](/articles/userns) - Brief overview of unprivileged User Namespaces, the security risk they enabled and how secureblue handles that risk.
 - [Kernel arguments](/articles/kargs) - List and brief explanation of the hardening kargs that the `ujust set-kargs-hardening` command can set.
 - [Flatpak](/articles/flatpak) - Flatpak: the good, the bad, the ugly.
-- [Build architecture](/articles/build-architecture) - Build architecture for secureblue
+- [Build architecture](/articles/build-architecture) - Build architecture for secureblue.

content/articles/BUILD_ARCHITECTURE.md

@@ -18,7 +18,7 @@ permalink: /articles/build-architecture
   - [Branch protection](#branch-protection)
 - [Build process](#build-process)
   - [Trivalent Build](#trivalent-build)
-  - [Secureblue Build](#secureblue-build)
+  - [secureblue Build](#secureblue-build)
   - [Image Updates](#image-updates)
 
 ## [Introduction](#introduction)
@@ -188,7 +188,7 @@ Branch protection via [rulesets](https://docs.github.com/en/repositories/configu
 1. Fetch context information from the GitHub Control Plane
 1. Generate, sign, and push the attestation to GitHub Artifacts
 
-### [Secureblue Build](#secureblue-build)
+### [secureblue Build](#secureblue-build)
 {: #secureblue-build}
 
 #### Build Job