Logs API: LoggerProvider docs issues

[lmolkova]

LoggerProvider docs are based on old spec language and should be updated.

Specifically:

1. Identifying parameters - different loggers should be returned if parameters are different

   opentelemetry-python/opentelemetry-api/src/opentelemetry/_logs/_internal/__init__.py

   Lines 165 to 166 in 59d6754

   	For any two calls it is undefined whether the same or different
   	`Logger` instances are returned, even for different library names.

   was changed recently (Define attributes equality and make all fields as identifying for Tracer, Meter, Logger, EventLogger opentelemetry-specification#4161) to make all parameters identifiable and guarantee that different loggers are returned.

   the implementation is already compliant, it's just a doc issue.

2. Logger name should be used as scope name

   opentelemetry-python/opentelemetry-api/src/opentelemetry/_logs/_internal/__init__.py

   Lines 172 to 176 in 59d6754

   	name: The name of the instrumenting module.
   	``__name__`` may not be used as this can result in
   	different logger names if the loggers are in different files.
   	It is better to use a fixed string that can be imported where
   	needed and used consistently as the name of the logger.

   Spec language

   For log sources which define a logger name (e.g. Java
   Logger Name)
   the Logger Name should be recorded as the instrumentation scope name.

   https://github.com/open-telemetry/opentelemetry-specification/blob/881f364cb5f64f7f276fbe2e69dbc5f2a0d4e76e/specification/logs/api.md#get-a-logger

   Recommendation is to change the doc to something like

   name: The name of the instrumenting module, package, module or class.
   For log sources which define a logger name (e.g. logging.Logger.name)
   the Logger Name should be recorded as the instrumentation scope name.

3. Attributes are not documented as parameter in get_logger API

   opentelemetry-python/opentelemetry-api/src/opentelemetry/_logs/_internal/__init__.py

   Lines 187 to 188 in 59d6754

   	schema_url: Optional. Specifies the Schema URL of the emitted telemetry.
   	"""

Part of open-telemetry/community#1751