Updating docs to reflect the improvements in Hermes (microsoft#532)

* Updating docs to reflect the improvements in 0.66

* Update .spelling

Co-authored-by: Jon Thysell <[email protected]>

Author: mganandraj

.spelling

@@ -78,4 +78,6 @@ exclusionList
 nvs
 packages.config
 ExperimentalFlags.props
-profiler
+profiler
+dll
+PDBs

docs/hermes.md

@@ -41,10 +41,8 @@ Set the `UseHermes` property to `false` in the `ExperimentalFeatures.props` file
 
 ### Known limitations
 
-- CPU Sampling profiler is not yet supported
 - Hermes is not yet compatible with other experimental features, like NuGet distribution or WinUI 3
-- The binary for Hermes is not yet signed by Microsoft
-- Debug builds of an app that uses Hermes are very slow
+- Hermes dll is not signed by Microsoft and the PDBs are not uploaded to the symbol servers
 
 ## Hermes on macOS