Shenzhou is China's crewed spacecraft, derived from the Russian Soyuz. It does not yet have its own tag, but there are currently 19 questions containing "shenzhou".
Shenzhou 11 was a specific flight of the Shenzhou spacecraft. It has its own tag, with 6 questions.
Four questions belong to both of the above groups (have "Shenzhou" in the question, and tagged shenzhou-11).
We generally don't make tags for specific missions, unless they are so notable as to produce a large number of questions. There's not much notable about the Shenzhou 11 mission. However, tags about spacecraft families are very useful. Should the shenzhou-11 tag be renamed shenzhou, thus broadening the use of the tag to include questions about the spacecraft family?