fix gitcode exercises+fix1

data/1.gml初阶/1.Git入门/1.Git简介/learn_003.json

 {
   "type": "code_options",
   "author": "csdn.net",
-  "source": "learn.md",
+  "source": "learn_003.md",
   "exercise_id": "399ebefcdd3444d4a99c140527c8d98d",
   "notebook_enable": false
 }
\ No newline at end of file

data/1.gml初阶/1.Git入门/2.Git安装/learn_003.json

 {
   "type": "code_options",
   "author": "csdn.net",
-  "source": "learn.md",
+  "source": "learn_003.md",
   "exercise_id": "2c2b3735973143c7a001d0f550a9b9c6",
   "notebook_enable": false
 }
\ No newline at end of file

data/1.gml初阶/1.Git入门/3.Git使用/learn_003.json

 {
   "type": "code_options",
   "author": "csdn.net",
-  "source": "learn.md",
+  "source": "learn_003.md",
   "exercise_id": "ec97e801f80f47e3a8218f511f9ecd06",
   "notebook_enable": false
 }
\ No newline at end of file

data/1.gml初阶/2.MarkDown入门/1.MarkDown介绍/learn_002.json

 {
   "type": "code_options",
   "author": "csdn.net",
-  "source": "learn.md",
+  "source": "learn_002.md",
   "exercise_id": "f033c7a4957a4f908f66f5a348274cde",
   "notebook_enable": false
 }
\ No newline at end of file

data/1.gml初阶/2.MarkDown入门/2.段落及强调/learn_003.json

 {
   "type": "code_options",
   "author": "csdn.net",
-  "source": "learn.md",
+  "source": "learn_003.md",
   "exercise_id": "b03d2e4169a14e2599719ab881974c0a",
   "notebook_enable": false
 }
\ No newline at end of file

data/1.gml初阶/2.MarkDown入门/3.标题/learn_001.json

 {
   "type": "code_options",
   "author": "csdn.net",
-  "source": "learn.md",
+  "source": "learn_001.md",
   "exercise_id": "8844d2a58b3744a59f004d067e6ec935",
   "notebook_enable": false
 }
\ No newline at end of file