small fix to the log appender definition (#4638)

## Changes

Minor fix in the explanation of log appender in the glossary.

"from an existing log API into OpenTelemetry using Logs API" -> "from an
existing logging library into OpenTelemetry using Logs API"

Author: Calm-Rock

specification/glossary.md

@@ -223,8 +223,8 @@ recommended to call it out specifically.
 
 ### Log Appender / Bridge
 
-A log appender or bridge is a component which bridges logs from an existing log
-API into OpenTelemetry using the [Log API](./logs/api.md). The
+A log appender or bridge is a component which bridges logs from an existing logging
+library into OpenTelemetry using the [Log API](./logs/api.md). The
 terms "log bridge" and "log appender" are used interchangeably, reflecting that
 these components bridge data into OpenTelemetry, but are often called appenders
 in the logging domain.