Apply suggestions from code review

Co-authored-by: Fedor Ivanov <[email protected]>

Author: vbaranov

setup/env-variables/backend-env-variables.mdx

@@ -660,12 +660,12 @@ Section created as a result of [#11417](https://github.com/blockscout/blockscout
 
 | Variable                                                            | Description                                                                                                                                                             | Parameters                                                          |
 | ------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------- |
-| `PUBLIC_METRICS_ENABLED`                                            | Variable to enable running queries at /public-metrics endpoint. Implemented in [#10469](https://github.com/blockscout/blockscout/pull/10469).                           | Version: v6.8.0\+ <br />Default: `false` <br />Applications: API    |
-| `PUBLIC_METRICS_UPDATE_PERIOD_HOURS`                                | Public metrics update period in hours at /public-metrics endpoint. Implemented in [#10469](https://github.com/blockscout/blockscout/pull/10469).                        | Version: v6.8.0\+ <br />Default: 24 <br />Applications: API         |
+| `PUBLIC_METRICS_ENABLED`                                            | Enables the `/public-metrics` endpoint. Implemented in [#10469](https://github.com/blockscout/blockscout/pull/10469).                                                   | Version: v6.8.0\+ <br />Default: `false` <br />Applications: API    |
+| `PUBLIC_METRICS_UPDATE_PERIOD_HOURS`                                | Update frequency (in hours) for refreshing data at the `/public-metrics` endpoint. Implemented in [#10469](https://github.com/blockscout/blockscout/pull/10469).        | Version: v6.8.0\+ <br />Default: 24 <br />Applications: API         |
 | `INDEXER_METRICS_ENABLED`                                           | Flag to enable base indexer metrics. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539).                                                      | Version: master <br />Default: true <br />Applications: Indexer     |
 | `INDEXER_METRICS_ENABLED_TOKEN_INSTANCES_NOT_UPLOADED_TO_CDN_COUNT` | Flag to enable indexer metric: the count of token instances not uploaded to CDN. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539).          | Version: master <br />Default: false <br />Applications: Indexer    |
 | `INDEXER_METRICS_ENABLED_FAILED_TOKEN_INSTANCES_METADATA_COUNT`     | Flag to enable indexer metric: the count of token instances with failed metadata fetches. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539). | Version: master <br />Default: true <br />Applications: Indexer     |
-| `INDEXER_METRICS_ENABLED_UNFETCHED_TOKEN_INSTANCES_COUNT`           | Flag to enable indexer metric: the count of unfetched token instances. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539).                    | Version: master <br />Default: true <br />Applications: Indexer     |
+| `INDEXER_METRICS_ENABLED_UNFETCHED_TOKEN_INSTANCES_COUNT`           | Flag to enable indexer metric: the count of token instances pending to fetch. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539).             | Version: master <br />Default: true <br />Applications: Indexer     |
 | `INDEXER_METRICS_ENABLED_MISSING_CURRENT_TOKEN_BALANCES_COUNT`      | Flag to enable indexer metric: the count of current token balances with missing values. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539).   | Version: master <br />Default: true <br />Applications: Indexer     |
 | `INDEXER_METRICS_ENABLED_MISSING_ARCHIVAL_TOKEN_BALANCES_COUNT`     | Flag to enable indexer metric: the count of archival token balances with missing values. Implemented in [#13539](https://github.com/blockscout/blockscout/pull/13539).  | Version: master <br />Default: true <br />Applications: Indexer     |