[skip ci]Update typos in scripts and tools md (#12391)

Signed-off-by: Nyanliang567 <yanliang.qiao@zilliz.com>

docs/design_docs/segcore/scripts_and_tools.md

@@ -7,10 +7,10 @@ The following scripts and commands may be used during segcore development
 - under milvus/internal/core directory
   - run `./run_clang_format .` to format cpp code
     - to call clang-format-10, need to install `apt install clang-format-10` in advance
-    - call `build-support/add_${lang}_license.sh` to add license info for cmake and cpp file
+    - call `build-support/add_${lang}_license.sh` to add license info for cmake and cpp files
 - under milvus/ directory
   - use `make cppcheck` to check format, including
     - if clang-format is executed
     - if license info is added
     - if `cpplint.py` standard meets , might need to be fixed by hand
-  - `make verifier` also include functions in `make cppcheck`
+  - `make verifier` also includes functions in `make cppcheck`