update links to openmetrics to reference the v1.0.0 release

Signed-off-by: David Ashpole <[email protected]>

Author: dashpole

content/docs/instrumenting/exposition_formats.md

@@ -152,7 +152,7 @@ and it is also available to use for federating metrics since at least v2.23.0.
 
 ### Exemplars (Experimental)
 
-Utilizing the OpenMetrics format allows for the exposition and querying of [Exemplars](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exemplars).
+Utilizing the OpenMetrics format allows for the exposition and querying of [Exemplars](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#exemplars).
 Exemplars provide a point in time snapshot related to a metric set for an otherwise summarized MetricFamily. Additionally they may have a Trace ID attached to them which when used to together
 with a tracing system can provide more detailed information related to the specific service.
 

content/docs/specs/native_histograms.md

@@ -181,7 +181,7 @@ dimensions:
    like” histograms where each bucket is a gauge, representing arbitrary
    distributions at a point in time. The concept of a gauge histogram was
    previously introduced for classic histograms by
-   [OpenMetrics](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#gaugehistogram).
+   [OpenMetrics](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#gaugehistogram).
 2. Integer vs. floating point (short: float): The obvious use case of
    histograms is to count observations, resulting in integer numbers of
    observations ≥ 0 within each bucket, including the _zero bucket_, and for

content/docs/specs/remote_write_spec_2_0.md

@@ -431,7 +431,7 @@ Typically, Senders can detect when a time series will no longer be appended usin
 
 Metadata SHOULD follow the official Prometheus guidelines for [Type](https://prometheus.io/docs/instrumenting/writing_exporters/#types) and [Help](https://prometheus.io/docs/instrumenting/writing_exporters/#help-strings).
 
-Metadata MAY follow the official OpenMetrics guidelines for [Unit](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#unit).
+Metadata MAY follow the official OpenMetrics guidelines for [Unit](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#unit).
 
 #### Exemplars