Tidy up some leftovers of crystal-lang#8847

src/log.cr

@@ -54,7 +54,7 @@
 # end
 # ```
 #
-# A `Log` will emit the messages to the `Log::Backends` attached to it as long as
+# A `Log` will emit the messages to the `Log::Backend`s attached to it as long as
 # the configured severity filter `level` permits it.
 #
 # Logs can also be created from a type directly. For the type `DB::Pool` the source `db.pool` will be used.

src/log/context.cr

@@ -1,6 +1,6 @@
 # Immutable structured context information for logging.
 #
-# See `Log.context`, `Log.context=`, `Log::Context#clear`, `Log::Context#set`, `Log::Context#using`.
+# See `Log.context`, `Log.context=`, `Log::Context#clear`, `Log::Context#set`, `Log.with_context`.
 class Log::Context
   Crystal.datum types: {bool: Bool, i: Int32, i64: Int64, f: Float32, f64: Float64, s: String, time: Time}, hash_key_type: String, immutable: true
 

src/log/main.cr

@@ -130,11 +130,11 @@ class Log
     end
 
     # :ditto:
-    def set(values : NamedTuple) forall V
+    def set(values : NamedTuple)
       extend_fiber_context(Fiber.current, Log::Context.new(values))
     end
 
-    private def extend_fiber_context(fiber : Fiber, values : Context) forall V
+    private def extend_fiber_context(fiber : Fiber, values : Context)
       context = fiber.logging_context
       fiber.logging_context = context.merge(values)
     end