"Semantic rules" of section 3.5 are actually syntactic rules

[adrienrougny]

Target

Specification

Issue type

Bug

Bug report

Level and version
Level: 1
Version: 1.3

Section and page
Section: 3.5 (Semantics rules)
Page: 43 -- 46

Bug description
Most "Semantic rules" of this section are in fact syntactic rules.

Proposed solution
Move those rules to section 3.4 "Syntax".

[adrienrougny]

Discussions at COMBINE 2024: @cannin will upload discussions notes

[cannin]

PDF with discussion notes:
pd_level1_version2_rule_discussion.pdf

[hasanbalci]

In light of the discussions at the Editors meeting, we decided to remove the distinction between syntactic and semantic rules for now. For this purpose, I updated the 3.4 Syntax heading to 3.4 Connectivity and containment, and 3.5 Semantic rules to 3.5 Glyph specific rules.

I also applied the "must/should" changes proposed in this pdf for the issue #249.

Finally, I removed the definitions of requirement and recommendation in the introduction of the Layout Rules section since we added a very similar but more generic version of it to the Introduction chapter of the specification (Page 2).