Improve line breaks in card 016 parts

Adjust line breaks for better text flow as suggested:
- part1: Break after "copy of" instead of after "a"
- part2: Break after "to the" instead of after "to"
- part3: Remove line break, keep as single line

Co-authored-by: jtemporal <6595551+jtemporal@users.noreply.github.com>

Author: Copilot

assets/img/mermaid/016-en.svg

@@ -5,9 +5,9 @@ title: fork?
 subtitle:
 concept: true
 parts:
-  - part1: it's nothing more than a\ncopy of a repository
-  - part2: this copy maintains a link to\nthe original repository
-  - part3: usually used to\npropose code changes
+  - part1: it's nothing more than a copy of\na repository
+  - part2: this copy maintains a link to the\noriginal repository
+  - part3: usually used to propose code changes
 number: "016"
 author: "@jtemporal"
 mermaid: true