Several small extensions docs system fixes...

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
===================================================================
--- chrome/common/extensions/api/extension_api.json	(revision 56756)
+++ chrome/common/extensions/api/extension_api.json	(working copy)
@@ -586,7 +586,7 @@
           "left": {"type": "integer", "description": "The offset of the window from the left edge of the screen in pixels."},
           "width": {"type": "integer", "description": "The width of the window in pixels."},
           "height": {"type": "integer", "description": "The height of the window in pixels."},
-          "tabs": {"type": "array", "items": { "$ref": "Tab" }, "optional": true, "description": "Array of <a href='tabs.html#type-Tab'>Tab</a> objects representing the current tabs in the window."},
+          "tabs": {"type": "array", "items": { "$ref": "Tab" }, "optional": true, "description": "Array of $ref:Tab objects representing the current tabs in the window."},
           "incognito": {"type": "boolean", "description": "Whether the window is incognito."},
           "type": {
             "type": "string",
@@ -664,7 +664,7 @@
             "optional": true,
             "description": "",
             "properties": {
-              "populate": {"type": "boolean", "optional": true, "description": "If true, each window object will have a <var>tabs</var> property that contains a list of the <a href='tabs.html#type-Tab'>Tab</a> objects for that window." }
+              "populate": {"type": "boolean", "optional": true, "description": "If true, each window object will have a <var>tabs</var> property that contains a list of the $ref:Tab objects for that window." }
             }
           },
           {