Document the weak-linking behavior of the availability attribute

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html
index bdb04ac..cbdebe1 100644
--- a/docs/LanguageExtensions.html
+++ b/docs/LanguageExtensions.html
@@ -665,6 +665,12 @@
   <dd>Apple's Mac OS X operating system. The minimum deployment target is specified by the <code>-mmacosx-version-min=<i>version</i></code> command-line argument.</dd>
+<p>A declaration can be used even when deploying back to a platform
+version prior to when the declaration was introduced. When this
+happens, the declaration is <a
+ href="">weakly
+linked</a>, as if the <code>weak_import</code> attribute were added to the declaration. A weakly-linked declaration may or may not be present a run-time, and a program can determine whether the declaration is present by checking whether the address of that declaration is non-NULL.</p>
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 <h2 id="checking_language_features">Checks for Standard Language Features</h2>
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