fix: update description format for git request-pull in toc-source.json to include code block for better readability

Author: mike-rambil

toc-source.json

@@ -58,7 +58,7 @@
         "examples": [
           {
             "code": "git request-pull main https://github.com/example/repo.git feature-branch",
-            "description": "Generates a summary like:\n\nThe following changes since commit 1234567... (main):\n\n  Some previous commit message\n\nare available in the Git repository at:\n\n  https://github.com/example/repo.git feature-branch\n\nfor you to fetch changes up to 89abcde... (feature-branch):\n\n  New feature commit message\n  Another commit message\n\n----------------------------------------------------------------\n file1.txt | 10 ++++++++++\n file2.js  |  5 +++++\n 2 files changed, 15 insertions(+)"
+            "description": "Generates a summary like:\n\n```The following changes since commit 1234567... (main):\n\n  Some previous commit message\n\nare available in the Git repository at:\n\n  https://github.com/example/repo.git feature-branch\n\nfor you to fetch changes up to 89abcde... (feature-branch):\n\n  New feature commit message\n  Another commit message\n\n----------------------------------------------------------------\n file1.txt | 10 ++++++++++\n file2.js  |  5 +++++\n 2 files changed, 15 insertions(+)\n```"
           },
           {
             "code": "git request-pull v1.0 https://github.com/example/repo.git v1.1",