Merge pull request #20683 from svick/patch-5

Added missing backtick

docs/compilers/CSharp/CommandLine.md

@@ -37,7 +37,7 @@
 | `/sourcelink`:*file* | [Source link](https://github.com/dotnet/core/blob/master/Documentation/diagnostics/source_link.md) info to embed into PDB.
 | `/optimize`{`+`|`-`} | Enable optimizations (Short form: `/o`)
 | `/deterministic` | Produce a deterministic assembly (including module version GUID and timestamp)
-| `/refonly | Produce a reference assembly, instead of a full assembly, as the primary output 
+| `/refonly` | Produce a reference assembly, instead of a full assembly, as the primary output 
 | **ERRORS AND WARNINGS**
 | `/warnaserror`{`+`|`-`} | Report all warnings as errors
 | `/warnaserror`{`+`|`-`}`:`*warn list* | Report specific warnings as errors