[Docs] Add CIBestPractices docs link to Reference.rst

[vbvictor]

Based on #165067 (comment).

[llvm-ci]

LLVM Buildbot has detected a new failure on builder clang-aarch64-quick running on linaro-clang-aarch64-quick while building llvm at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/65/builds/24530

Here is the relevant piece of the build log for the reference

Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'lit :: max-time.py' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 5
env -u FILECHECK_OPTS "/usr/bin/python3.10" /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/utils/lit/lit.py -j1 --order=lexical Inputs/max-time --max-time=5 2>&1  |  FileCheck /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/utils/lit/tests/max-time.py
# executed command: env -u FILECHECK_OPTS /usr/bin/python3.10 /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/utils/lit/lit.py -j1 --order=lexical Inputs/max-time --max-time=5
# executed command: FileCheck /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/utils/lit/tests/max-time.py
# .---command stderr------------
# | /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/utils/lit/tests/max-time.py:8:10: error: CHECK: expected string not found in input
# | # CHECK: Skipped: 1
# |          ^
# | <stdin>:2:51: note: scanning from here
# | warning: reached timeout, skipping remaining tests
# |                                                   ^
# | <stdin>:7:2: note: possible intended match here
# |  Skipped: 2 (100.00%)
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/utils/lit/tests/max-time.py
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            1: -- Testing: 2 tests, 1 workers -- 
# |            2: warning: reached timeout, skipping remaining tests 
# | check:8'0                                                       X error: no match found
# |            3:  
# | check:8'0     ~
# |            4: Testing Time: 5.31s 
# | check:8'0     ~~~~~~~~~~~~~~~~~~~~
# |            5:  
# | check:8'0     ~
# |            6: Total Discovered Tests: 2 
# | check:8'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            7:  Skipped: 2 (100.00%) 
# | check:8'0     ~~~~~~~~~~~~~~~~~~~~~~
# | check:8'1      ?                     possible intended match
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

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

[llvm-ci]

LLVM Buildbot has detected a new failure on builder lldb-aarch64-windows running on linaro-armv8-windows-msvc-05 while building llvm at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/12520

Here is the relevant piece of the build log for the reference

Step 6 (test) failure: build (failure)
...
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/3/12 (2310 of 2319)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/4/12 (2311 of 2319)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/5/12 (2312 of 2319)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/6/12 (2313 of 2319)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/7/12 (2314 of 2319)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/8/12 (2315 of 2319)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/9/12 (2316 of 2319)
PASS: lldb-unit :: tools/lldb-server/tests/./LLDBServerTests.exe/0/2 (2317 of 2319)
PASS: lldb-unit :: tools/lldb-server/tests/./LLDBServerTests.exe/1/2 (2318 of 2319)
TIMEOUT: lldb-unit :: Host/./HostTests.exe/1/10 (2319 of 2319)
******************** TEST 'lldb-unit :: Host/./HostTests.exe/1/10' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\unittests\Host\.\HostTests.exe-lldb-unit-10688-1-10.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=10 GTEST_SHARD_INDEX=1 C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\unittests\Host\.\HostTests.exe
--

Note: This is test shard 2 of 10.

[==========] Running 8 tests from 7 test suites.

[----------] Global test environment set-up.

[----------] 1 test from ConnectionFileDescriptorTest

[ RUN      ] ConnectionFileDescriptorTest.TCPGetURIv6

[       OK ] ConnectionFileDescriptorTest.TCPGetURIv6 (2 ms)

[----------] 1 test from ConnectionFileDescriptorTest (2 ms total)



[----------] 1 test from FileSystemTest

[ RUN      ] FileSystemTest.MakeAbsolute

[       OK ] FileSystemTest.MakeAbsolute (0 ms)

[----------] 1 test from FileSystemTest (0 ms total)



[----------] 1 test from HostInfoTestInitialization

[ RUN      ] HostInfoTestInitialization.InitTwice

[       OK ] HostInfoTestInitialization.InitTwice (1 ms)

[----------] 1 test from HostInfoTestInitialization (1 ms total)