Return --global to git authorship guideline (#963)

* Update suggest-change.md

* Return --global to git authorship guideline

Author: alexv-smirnov

ydb/docs/en/core/development/suggest-change.md

@@ -136,8 +136,8 @@ Run the following command from your repository directory to set up your name and
 cd ~/ydbwork/ydb
 ```
 ```
-git config user.name "Marco Polo"
-git config user.email "marco@ydb.tech"
+git config --global user.name "Marco Polo"
+git config --global user.email "marco@ydb.tech"
 ```
 
 ## Working on a feature {#feature}

ydb/docs/ru/core/development/suggest-change.md

@@ -138,8 +138,8 @@ cd ~/ydbwork
 cd ~/ydbwork/ydb
 ```
 ```
-git config user.name "Marco Polo"
-git config user.email "marco@ydb.tech"
+git config --global user.name "Marco Polo"
+git config --global user.email "marco@ydb.tech"
 ```
 
 ## Работа над изменением {#feature}
@@ -241,4 +241,4 @@ Pull Request может быть замержен после получения
 gh repo sync your_github_login/ydb -s ydb-platform/ydb
 git fetch origin main:main
 git rebase main
-```
+```