[llvm] [NFC] Fix typos in llvm-mc doc (PR #72457)

[Aiden Grossman via llvm-commits]

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@@ -11,13 +11,13 @@ SYNOPSIS
 DESCRIPTION
 -----------
 
-The :program:`llvm-mc` command take input as the assembly code for a specified
-architecture and generate object file or executable as a output for a specified
-architecture.
+The :program:`llvm-mc` command takes as input assembly code for a specified
+architecture and generates as output an object file or executable for a
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boomanaiden154 wrote:

Nit: maybe `generates an object file`?

https://github.com/llvm/llvm-project/pull/72457