add misc & linalg doc

doc/source/index.rst

@@ -25,6 +25,7 @@
    jittor.dataset
    jittor.transform
    jittor.mpi
+   jittor.linalg
 
 
 .. toctree::

doc/source/jittor.linalg.md

@@ -0,0 +1,10 @@
+jittor.linalg
+=====================
+
+这里是Jittor的线性代数函数的API文档，您可以通过`from jittor import linalg`来获取该模块。
+
+```eval_rst
+.. automodule:: jittor.linalg
+   :members:
+   :undoc-members:
+```

doc/source/jittor.md

@@ -42,3 +42,13 @@ jittor
    :members:
    :undoc-members:
 ```
+
+## jittor.Misc
+
+这里是Jittor的基础算子模块的API文档，该API可以通过`jittor.misc.XXX`或者`jittor.XXX`直接访问。
+
+```eval_rst
+.. automodule:: jittor.misc
+   :members:
+   :undoc-members:
+```