fix(console): remove backticks from mangled PR review suggestion (con…

…sole-rs#105)

This is my fault, sorry --- I messed up a review suggestion for PR console-rs#104
and broke the build.

This should get it compiley again.

console-subscriber/src/visitors.rs

@@ -1,5 +1,4 @@
 //! These visitors are responsible for extracting the relevant
-```
 //! fields from tracing metadata and producing the parts
 //! needed to construct `Event` instances.