Aim math API for 1.3.3 instead of 1.4.0
diff --git a/docs/harfbuzz-docs.xml b/docs/harfbuzz-docs.xml
index ea99732..7a42d23 100644
--- a/docs/harfbuzz-docs.xml
+++ b/docs/harfbuzz-docs.xml
@@ -180,9 +180,9 @@
         <title>Index of new symbols in 1.2.3</title>
         <xi:include href="xml/api-index-1.2.3.xml"><xi:fallback /></xi:include>
       </index>
-      <index id="api-index-1-4-0" role="1.4.0">
-        <title>Index of new symbols in 1.4.0</title>
-        <xi:include href="xml/api-index-1.4.0.xml"><xi:fallback /></xi:include>
+      <index id="api-index-1.3.3" role="1.3.3">
+        <title>Index of new symbols in 1.3.3</title>
+        <xi:include href="xml/api-index-1.3.3.xml"><xi:fallback /></xi:include>
       </index>
       <index id="deprecated-api-index" role="deprecated">
         <title>Index of deprecated API</title>