[clang] [clang][doc] Improve error handling for `LibTooling` example code avoiding core dump (PR #98129)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Rajveer Singh Bharadwaj (Rajveer100)

<details>
<summary>Changes</summary>

Resolves #<!-- -->97983

---
Full diff: https://github.com/llvm/llvm-project/pull/98129.diff


1 Files Affected:

- (modified) clang/docs/LibTooling.rst (+2-2) 


``````````diff
diff --git a/clang/docs/LibTooling.rst b/clang/docs/LibTooling.rst
index 87d84321ab283..c6687fb9642f9 100644
--- a/clang/docs/LibTooling.rst
+++ b/clang/docs/LibTooling.rst
@@ -75,7 +75,7 @@ and automatic location of the compilation database using source files paths.
     auto ExpectedParser = CommonOptionsParser::create(argc, argv, MyToolCategory);
     if (!ExpectedParser) {
       // Fail gracefully for unsupported options.
-      llvm::errs() << ExpectedParser.takeError();
+      llvm::errs() << toString(ExpectedParser.takeError());
       return 1;
     }
     CommonOptionsParser& OptionsParser = ExpectedParser.get();
@@ -142,7 +142,7 @@ version of this example tool is also checked into the clang tree at
   int main(int argc, const char **argv) {
     auto ExpectedParser = CommonOptionsParser::create(argc, argv, MyToolCategory);
     if (!ExpectedParser) {
-      llvm::errs() << ExpectedParser.takeError();
+      llvm::errs() << toString(ExpectedParser.takeError());
       return 1;
     }
     CommonOptionsParser& OptionsParser = ExpectedParser.get();

``````````

</details>


https://github.com/llvm/llvm-project/pull/98129