update conf.py

Author: cyjseagull

3.x/zh_CN/.readthedocs.yaml

@@ -17,8 +17,8 @@ sphinx:
   configuration: 3.x/zh_CN/conf.py
 
 # Optionally build your docs in additional formats such as PDF and ePub
- formats:
-    - pdf
+formats:
+  - pdf
 #    - epub
 
 # Optional but recommended, declare the Python requirements required

3.x/zh_CN/conf.py

@@ -272,7 +272,7 @@
 \DeclareUnicodeCharacter{221B}{\ensuremath{\sqrt[3]{}}}
 \DeclareUnicodeCharacter{2295}{\ensuremath{\oplus}}
 \DeclareUnicodeCharacter{2297}{\ensuremath{\otimes}}
-\begin{CJK}{UTF8}
+\begin{CJK}{UTF8}{gbsn}
 \AtEndDocument{\end{CJK}}
 ''',
 # Latex figure (float) alignment