[clang][NFC] now that C99/C11 are out of the way, open details by default

Author: h-vetinari

clang/www/c_status.html

@@ -785,7 +785,7 @@ <h2 id="c11">C11 implementation status</h2>
 <p>Clang implements a significant portion of the ISO 9899:2011 (C11) standard, but the status of individual proposals is still under investigation.</p>
 <p>You can use Clang in C11 mode with the <code>-std=c11</code> option (use <code>-std=c1x</code> in Clang 3.0 and earlier).</p>
 
-<details>
+<details open>
 <summary>List of features and minimum Clang version with support</summary>
 
 <table width="689" border="1" cellspacing="0">
@@ -1011,7 +1011,7 @@ <h2 id="c99">C99 implementation status</h2>
      When I can't map the feature back to a paper, I mark it as unknown. -->
 <p>You can use Clang in C99 mode with the <code>-std=c99</code> option.</p>
 
-<details>
+<details open>
 <summary>List of features and minimum Clang version with support</summary>
 
 <table width="689" border="1" cellspacing="0">