build: fix gitattributes (#8072)

Author: jeremylong

.gitattributes

@@ -1,8 +1,13 @@
 *.html linguist-documentation
-(^|/)site/) linguist-documentation
-src/test/resources/* linguist-vendored
-cli/src/test/resources/* linguist-vendored
-core/src/test/resources/* linguist-vendored
-maven/src/test/resources/* linguist-vendored
-ant/src/test/resources/* linguist-vendored
-utils/src/test/resources/* linguist-vendored
+src/site/** linguist-documentation
+cli/src/site/** linguist-documentation
+core/src/site/** linguist-documentation
+maven/src/site/** linguist-documentation
+ant/src/site/** linguist-documentation
+utils/src/site/** linguist-documentation
+src/test/resources/** linguist-vendored
+cli/src/test/resources/** linguist-vendored
+core/src/test/resources/** linguist-vendored
+maven/src/test/resources/** linguist-vendored
+ant/src/test/resources/** linguist-vendored
+utils/src/test/resources/** linguist-vendored