[llvm] [QualGroup][docs] Update meeting schedule and link for slides (PR #169458)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-arm64-windows-msvc` running on `linaro-armv8-windows-msvc-04` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/161/builds/9104

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: Testing/Support/./TestingSupportTests.exe/0/3' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\unittests\Testing\Support\.\TestingSupportTests.exe-LLVM-Unit-218880-0-3.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=3 GTEST_SHARD_INDEX=0 C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\unittests\Testing\Support\.\TestingSupportTests.exe
--

Script:
--
C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\unittests\Testing\Support\.\TestingSupportTests.exe --gtest_filter=TempPathTest.TempDir
--
C:/Users/tcwg/llvm-worker/clang-arm64-windows-msvc/llvm-project/llvm/unittests/Testing/Support/TempPathTest.cpp(40): error: Value of: sys::fs::exists(Path)
  Actual: true
Expected: false


C:/Users/tcwg/llvm-worker/clang-arm64-windows-msvc/llvm-project/llvm/unittests/Testing/Support/TempPathTest.cpp:40
Value of: sys::fs::exists(Path)
  Actual: true
Expected: false



********************


```

</details>

https://github.com/llvm/llvm-project/pull/169458