fix(content-docs): do not echo git history to console (#5906)

Author: Josh-Cena

packages/docusaurus-plugin-content-docs/src/lastUpdate.ts

@@ -42,7 +42,9 @@ export async function getFileLastUpdate(
       return null;
     }
 
-    const result = shell.exec(`git log -1 --format=%ct,%an ${filePath}`);
+    const result = shell.exec(`git log -1 --format=%ct,%an ${filePath}`, {
+      silent: true,
+    });
     if (result.code !== 0) {
       throw new Error(
         `Retrieval of git history failed at ${filePath} with exit code ${result.code}: ${result.stderr}`,