Update design docs and their status (#791)

* Update design docs and their status

* Update exact-match-selector-options.md

* Update quoted-literals.md

* Update selection-matching-options.md

* Update string-selection-formatting.md

* Update variable-mutability.md

* Update variants.md

* Update exploration/variable-mutability.md

Co-authored-by: Eemeli Aro <[email protected]>

---------

Co-authored-by: Eemeli Aro <[email protected]>

Author: aphillips

exploration/code-mode-introducer.md

@@ -1,6 +1,6 @@
 # Design Proposal: Choosing a Code Mode Introducer
 
-Status: **Proposed**
+Status: **Accepted**
 
 <details>
 	<summary>Metadata</summary>
@@ -77,10 +77,9 @@ private-start  = "^" / "&"
 
 _Describe the proposed solution. Consider syntax, formatting, errors, registry, tooling, interchange._
 
-We need to choose one of these (or another option not yet considered).
-Presentation at UTW did not produce any opinions.
-
-Based on the pro/cons below, I would suggest Option D is possibly the best option?
+A modified version of Option D was chosen.
+The keyword `when` was dropped after this design was completed.
+"Simple" messages do not require the `pattern` to be quoted.
 
 ## Alternatives Considered
 

exploration/exact-match-selector-options.md

@@ -1,4 +1,4 @@
-# Design Proposal Template
+# Name of the "Exact Match" selector function
 
 Status: **Accepted**
 

exploration/quoted-literals.md

@@ -1,6 +1,6 @@
 # Quoted Literals
 
-Status: **Proposed**
+Status: **Accepted**
 
 <details>
 	<summary>Metadata</summary>

exploration/selection-matching-options.md

@@ -1,5 +1,20 @@
 # Selection Matching Options
 
+Status: **Obsolete**
+
+<details>
+	<summary>Metadata</summary>
+	<dl>
+		<dt>Contributors</dt>
+		<dd>@aphillips</dd>
+	</dl>
+</details>
+
+> [!NOTE]
+> This document was used as part of the discussion for choosing the type of matching.
+> It is preserved for historical reasons, but does not conform to the format of a
+> normal design document.
+
 ## Recommendation
 
 We are discussing whether to change First-Match to another value. Currently voting looks like:

exploration/string-selection-formatting.md

@@ -1,6 +1,6 @@
 # Selection and Formatting on String Values
 
-Status: **Proposed**
+Status: **Accepted**
 
 <details>
 	<summary>Metadata</summary>

exploration/variable-mutability.md

@@ -1,4 +1,4 @@
-# Design Proposal Template
+# Variable Namespacing and Mutability
 
 Status: **Accepted**
 

exploration/variants.md

@@ -3,6 +3,10 @@
 This is a collection of message examples which require a branching logic to
 handle grammatical variations of the copy.
 
+> [!NOTE]
+> This document contains examples used during design discussions.
+> It is not a formal design document and is preserved for historical reasons.
+
 ## Regular plurals
 
 ### English