add troubleshoot-lock-conflicts (pingcap#2932)

* add troubleshoot-lock-conflicts

* Update troubleshoot-lock-conflicts.md

Co-authored-by: zhenjiao gao <[email protected]>

* Update troubleshoot-lock-conflicts.md

Co-authored-by: Lynn <[email protected]>

* Update troubleshoot-lock-conflicts.md

Co-authored-by: zhenjiao gao <[email protected]>

* fix indent and format issues

* make level two or more headings sentence-case style

* adjust troubleshoot-lock-conflicts

* fix ci

* update

* Apply suggestions from code review

* Update troubleshoot-lock-conflicts.md

* Update troubleshoot-lock-conflicts.md

* Update troubleshoot-lock-conflicts.md

* Update troubleshoot-lock-conflicts.md

* Update troubleshoot-lock-conflicts.md

* Update troubleshoot-lock-conflicts.md

* Update troubleshoot-lock-conflicts.md

* fix ci

* Update troubleshoot-lock-conflicts.md

Co-authored-by: Keke Yi <[email protected]>

* Apply suggestions from code review

* adjust troubleshoot-lock-conflicts

Co-authored-by: Keke Yi <[email protected]>
Co-authored-by: zhenjiao gao <[email protected]>
Co-authored-by: Lynn <[email protected]>
Co-authored-by: yikeke <[email protected]>
Co-authored-by: ti-srebot <[email protected]>

Author: 6 people

TOC.md

@@ -89,6 +89,7 @@
   + [Troubleshoot Hotspot Issues](/troubleshoot-hot-spot-issues.md)
   + [Troubleshoot Cluster Setup](/troubleshoot-tidb-cluster.md)
   + [Troubleshoot High Disk I/O Usage](/troubleshoot-high-disk-io.md)
+  + [Troubleshoot Lock Conflicts](/troubleshoot-lock-conflicts.md)
   + [Troubleshoot TiCDC](/ticdc/troubleshoot-ticdc.md)
   + [Troubleshoot TiFlash](/tiflash/troubleshoot-tiflash.md)
   + [Troubleshoot Write Conflicts in Optimistic Transactions](/troubleshoot-write-conflicts.md)