Typos within Mixin Dasboards.

[Whyeasy]

Describe the bug

Within the Loki-Mixin and 'Promtail-Mixin` dashboards I think I found some typos. I'm fine to create the PR, but just wanted to double check if they are indeed typos.

loki/production/loki-mixin/dashboards/loki-reads.libsonnet

Line 126 in 89b8ae4

dashboards['loki-reads.json'].matchers.querier + [utils.selector.re('route', grpc_routes)],

I guess .matchers.querier should be .matchers.ingester?

loki/production/promtail-mixin/dashboards.libsonnet

Line 79 in 89b8ae4

g.qpsPanel('promtail_request_duration_seconds_count{%s}')

Is missing the % dashboards['promtail.json'].selector.

To Reproduce
Steps to reproduce the behavior:

1. Generate the dashboards.
2. Promtail dashboard will show the error: Parse error: unexpected character inside braces: %
3. In the Loki Reads dashboard the Ingester Latency will show the same data as the Querier Latency, but the Ingester has it's own metrics for this panel.

Expected behavior
The Promtail dashboard will show the data instead of the error and the Loki Read dashboard will show the correct data.

Environment:

• Infrastructure: Kubernetes
• Deployment tool: jsonnet.

[stale]

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