fix(scripts): fix some typo

GitOrigin-RevId: fe3b6b3ceb6ecd2f861329f5b5c75589f206b36f

README.md

@@ -29,7 +29,7 @@
     The script accepts the MegEngine installation and MegBrain clone path as the argument.
 
     ```bash
-    ./gen_python_docs/gen_html.sh $MGE_ROOT $MEB_ROOT
+    ./gen_python_docs/gen_html.sh $MGB_ROOT $MGE_ROOT(optional)
     ```
 
     Note that the RST files generated from python docstring are put under `source/autogen`.
@@ -55,7 +55,7 @@
 API docstring also contains examples written by [doctest](https://docs.python.org/3/library/doctest.html). Run the tests by
 
 ```bash
-gen_python_docs/gen_html.sh ~/.local/lib/python3.6/site-packages $MEB_ROOT
+gen_python_docs/gen_html.sh $MGB_ROOT ~/.local/lib/python3.6/site-packages/megengine
 sphinx-build -b doctest source build/doctest
 ```
 
@@ -87,4 +87,4 @@ find the class rst file and copy its name and replace the doc with
 find the file and copy its name and replace the doc with
 ```
 :ref:`file_file_<filename>`
-```
\ No newline at end of file
+```

gen_python_docs/gen_html.sh

@@ -8,10 +8,12 @@ rm -rf source/cpp_api
 
 set -e
 
-if [ ! -n "$2" ]
+if [ ! -n "$1" ]
 then
     echo "MegBrain directory not provided"
     exit 1
+else
+    MGB_ROOT=$1
 fi
 
 exec 3<"source/include/h_file.txt"
@@ -20,15 +22,15 @@ exec 4<"source/include/h_location.txt"
 while read line1<&3 && read line2<&4
 do
     mkdir -p "source/include/file${line2%/*}"
-    cp ${2}${line1} "source/include/file${line2%/*}"
+    cp ${MGB_ROOT}${line1} "source/include/file${line2%/*}"
 done
 
-if [ ! -n "$1" ]; then
+if [ ! -n "$2" ]; then
     MGE_ROOT=`python3 -c "import os; \
                           import megengine; \
                           print(os.path.dirname(megengine.__file__))"`
 else
-    MGE_ROOT=$1
+    MGE_ROOT=$2
 fi
 
 ./gen_python_docs/gendoc.sh $MGE_ROOT
@@ -45,4 +47,4 @@ export API_DIR="api_zh"
 rm -rf build/html/api
 mkdir build/html/api
 cp .tmp/* build/html/api
-rm -rf .tmp
\ No newline at end of file
+rm -rf .tmp