[llvm] [llvm] Proofread ProgrammersManual.rst (PR #150787)

[Tim Gymnich via llvm-commits]

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@@ -1603,18 +1603,18 @@ to keep ``sizeof(SmallVector<T>)`` around 64 bytes).
 SmallVector also provides a nice portable and efficient replacement for
 ``alloca``.
 
-SmallVector has grown a few other minor advantages over std::vector, causing
+SmallVector has grown a few other minor advantages over ``std::vector``, causing
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tgymnich wrote:

```suggestion
``SmallVector`` has grown a few other minor advantages over ``std::vector``, causing
```
is this missing the ``?

https://github.com/llvm/llvm-project/pull/150787