Use less confusing name for rendered JsonFormatter in the benchmarks table [skip ci]

Author: nblumhardt

README.md

@@ -140,7 +140,7 @@ See `test/Serilog.Formatting.Compact.Tests/FormattingBenchmarks.cs`.
 |:------------------------------ |----------: |---------: |------: |
 |                `JsonFormatter` | 11.2775 µs | 0.0682 µs |   1.00 |
 |         `CompactJsonFormatter` |  6.0315 µs | 0.0429 µs |   0.53 |
-|        `RenderedJsonFormatter` | 13.7585 µs | 0.1194 µs |   1.22 |
+|        `JsonFormatter(renderMessage: true)` | 13.7585 µs | 0.1194 µs |   1.22 |
 | `RenderedCompactJsonFormatter` |  7.0680 µs | 0.0605 µs |   0.63 |
 
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