Update SIP pages (#3239)

* Add conditional display for shipped field showing preview feature availability with link to documentation
* Add new SIP-71 (into) proposal
* Minor updates to SIP-61, SIP-62, and SIP-68 in sync with SIP repository

Author: bracevac

_layouts/sip.html

@@ -24,12 +24,13 @@ <h5 class="contents">Status</h5>
 					  It might be available as an experimental feature in the latest version of the compiler.
 					{% endif %}
 				</p>
-				{% else if page.stage == "completed" %}
+				{% elsif page.stage == "completed" and page.status == "shipped" %}
 				<p>
 					This proposal has been implemented,
-					{% if page.status == "accepted" %}
-					  it will be available in the next minor release of the compiler.
-					{% else if page.status == "shipped" %}
+					{% if page.shipped %}
+					  it has been made available as a <a href="https://scala-lang.org/api/3.x/docs/docs/reference/preview/index.html">preview feature</a> in Scala {{ page.shipped }} and
+					  will be activated by default in the next minor release of the compiler.
+					{% else %}
 					  it is available in the latest version of the compiler.
 					{% endif %}
 				</p>

_sips/all.md

@@ -25,7 +25,7 @@ of the compiler (accepted). Click on a proposal to read its content.
 <div class="sip-list">
   <ul>
   {% for sip in sips %}
-   {% if sip.stage == "completed" %}
+   {% if sip.stage == "completed" and sip.status == "shipped" %}
      <li class="no-fragmentation">
       <strong><a href="{{ sip.url }}">{{ sip.kind | default: 'SIP' }}-{{ sip.number }} - {{ sip.title }}</a></strong>
       <div class="tag" style="background-color: {{ sipData[sip.status].color }}">{{ sipData[sip.status].text }}</div>

_sips/sips/061-unroll-default-arguments.md

@@ -2,8 +2,8 @@
 layout: sip
 number: 61
 permalink: /sips/:title.html
-stage: implementation
-status: under-review
+stage: completed
+status: accepted
 title: Unroll Default Arguments for Binary Compatibility
 ---
 

_sips/sips/062-better-fors.md

@@ -2,8 +2,8 @@
 layout: sip
 number: 62
 permalink: /sips/:title.html
-stage: implementation
-status: under-review
+stage: completed
+status: shipped
 title: For comprehension improvements
 ---
 

_sips/sips/068-reference-package-objects.md

@@ -3,7 +3,7 @@ layout: sip
 number: 68
 permalink: /sips/:title.html
 stage: completed
-status: shipped
+status: accepted
 title: Reference-able Package Objects
 ---