Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>
Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/client/common/metrics/_metric.py

@@ -23,7 +23,7 @@ class Metric(enum.Enum):
           components reset it on UTC 00:00:00.
 
         - This energy metric does not specify the start time of the accumulation
-          period,and therefore can be inconsistent.
+          period, and therefore can be inconsistent.
     """
 
     UNSPECIFIED = metrics_pb2.METRIC_UNSPECIFIED

src/frequenz/client/common/metrics/_sample.py

@@ -39,7 +39,7 @@ class AggregatedMetricValue:
 
     This message represents derived metrics and contains fields for statistical
     summaries—minimum, maximum, and average values. Individual measurements are
-    are optional, accommodating scenarios where only subsets of this information
+    optional, accommodating scenarios where only subsets of this information
     are available.
     """
 
@@ -202,9 +202,9 @@ def as_single_value(
     ) -> float | None:
         """Return the value of this sample as a single value.
 
-        if [`value`][frequenz.client.microgrid.metrics.MetricSample.value] is a `float`,
+        if [`value`][frequenz.client.common.metrics.MetricSample.value] is a `float`,
         it is returned as is. If `value` is an
-        [`AggregatedMetricValue`][frequenz.client.microgrid.metrics.AggregatedMetricValue],
+        [`AggregatedMetricValue`][frequenz.client.common.metrics.AggregatedMetricValue],
         the value is aggregated using the provided `aggregation_method`.
 
         Args: