In this PR I added an `@since` tag to SNIPPET_PATH and isBlockTag() as they were added in later versions
- SNIPPET_PATH was added in JDK 18 [here](https://github.com/openjdk/jdk/commit/0fc47e99d20a1ee886df878f1302769bdd913aab#diff-8f73114f8b0d0d5229231541d5583382c8e8d33147e285f3d90ed8801ce9228bR192) - isBlockTag() was added in JDK 15 [here](https://github.com/openjdk/jdk/commit/3c0e2b4e16d8fb2f96741bc8d4188aa47f58dd15#diff-3ee1b6e2a11b201a39ce3f2ac14ea9832900d8a3a581bf26577064173d0c9082R101) This is similar to #18032 ------------- Commit messages: - add `@since` to `SNIPPET_PATH` and `isBlockTag()` Changes: https://git.openjdk.org/jdk/pull/18640/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18640&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8329717 Stats: 5 lines in 2 files changed: 3 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/18640.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18640/head:pull/18640 PR: https://git.openjdk.org/jdk/pull/18640
