fix(docs): Capitalize Markdown and Frontmatter

markdown/dev/howtos/editors/frontmatter/about/en.md

@@ -3,14 +3,14 @@ title: About Frontmatter
 order: 10
 ---
 
-Frontmatter is a way to add metadata to markdown documents.
+Frontmatter is a way to add metadata to Markdown documents.
 
 Frontmatter sits at the top of the file (it's matter that's at the front) and is
 surrounded by lines with three dashes on them:
 
 ```md
 ---
-title: This is frontmatter
+title: This is Frontmatter
 ---
 ```
 

markdown/dev/howtos/editors/frontmatter/en.md

@@ -2,7 +2,7 @@
 title: Working with Frontmatter
 ---
 
-Frontmatter is a way to add metadata to markdown documents.
+Frontmatter is a way to add metadata to Markdown documents.
 It is used extensively on freesewing.org and freesewing.dev alike.
 
 Here's what you need to know:

markdown/dev/tutorials/getting-started-windows/en.md

@@ -102,7 +102,7 @@ design shortcoming it does not respect certain editorconfig options which will
 break certain files in the freesewing project ([see vscode/65663 for
 details](https://github.com/microsoft/vscode/issues/65663)). If you use this
 editor please ensure that your settings.json file is configured to not trim
-trailing whitespace from markdown files. The following snippet can be added to
+trailing whitespace from Markdown files. The following snippet can be added to
 your settings.json file to add an exemption for this file type:
 
 ```json