[clang] [Clang][Docs] Fixed typos of sentinel attribute (PR #205539)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Tony Guillot (to268)

<details>
<summary>Changes</summary>

I have previously documented the sentinel attribute but some typos have been missed during the review process.

---
Full diff: https://github.com/llvm/llvm-project/pull/205539.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/AttrDocs.td (+2-2) 


``````````diff
diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
index 04362de2d5be2..bc6a93002ead7 100644
--- a/clang/include/clang/Basic/AttrDocs.td
+++ b/clang/include/clang/Basic/AttrDocs.td
@@ -10173,7 +10173,7 @@ call. The attribute accepts two optional arguments: the first argument is the
 position of the expected sentinel value, starting from the last parameter. The
 second argument describes whether the last fixed parameter is treated as a
 valid sentinel value when set to '1'.
-All arguments described above defaults to '0' when elided.
+All arguments described above default to '0' when elided.
 The attribute is also supported with blocks and in Objective-C.
 
 .. code-block:: c
@@ -10187,7 +10187,7 @@ The attribute is also supported with blocks and in Objective-C.
     foo("Another", "example", NULL);
     foo("Missing", "sentinel"); // Not OK
 
-    bar(1, 2, NULL, 3);         // OK: sentinel value at the 2nd to last positon
+    bar(1, 2, NULL, 3);         // OK: sentinel value at the 2nd to last position
     bar(1, 2, 3, nullptr, 4);   // OK: `nullptr` is valid in C23
     bar(1, 2, 3, 4, NULL);      // Not OK
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/205539