Update doc for explain analyze (#4655)
Update doc for explain analyze (#4655)

* update doc for explain analyze

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* refine

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* fix lint

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* add join stats

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* refine

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* Update sql-statements/sql-statement-explain-analyze.md

* address comment

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* update

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* Update sql-statements/sql-statement-explain-analyze.md

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>

* Update sql-statements/sql-statement-explain-analyze.md

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>

* hash map => hash table

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* Update sql-statements/sql-statement-explain-analyze.md

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>

* Update sql-statements/sql-statement-explain-analyze.md

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>

* Update sql-statements/sql-statement-explain-analyze.md

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>

* address comment

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* address comment

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* refine doc

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>

* Apply suggestions from code review

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>
Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>
pingcap/docs-cn,pingcap/docs-cn