feat: add documenting everything guide

Author: Lancern

src/components/feature-test-macro/FeatureTestMacroValue.astro

@@ -9,9 +9,11 @@ interface Props {
 const { value, since } = Astro.props;
 ---
 
-<td>{value}</td>
-<td class="ftm-since-cell">{since}</td>
-<td><slot /></td>
+<tr>
+  <td>{value}</td>
+  <td class="ftm-since-cell">{since}</td>
+  <td><slot /></td>
+</tr>
 
 <style>
   .ftm-since-cell {

src/content/docs/c/library/headers/index.mdx

@@ -27,9 +27,9 @@ The interface of C standard library is defined by the following collection of he
     <RevisionBlock slot="item" noborder since="C99" dir="v">
       <CHeader name="complex" />
     </RevisionBlock>
-    Conditionally compiled macro that compares its argument to zero
+    Complex number arithmetic
   </Desc>
-  
+
   <Desc>
     <CHeader slot="item" name="ctype" />
     Functions to determine the type contained in character data

src/content/docs/development/guide/_meta.yml

@@ -1,2 +1,2 @@
 label: Development Guideline
-order: 2
+order: 2