[chore][release.md] checkout release branch to the correct commit & u…

…pdate release schedule (#11938)

#### Description
If more PRs are merged after the release PR commit, make sure to
checkout the release branch to the release PR commit rather than the
mainline head.

docs/release.md

@@ -51,7 +51,7 @@ Before the release, make sure there are no open release blockers in [core](https
    `open-telemetry/opentelemetry-collector`. Assuming your upstream remote is
    named `upstream`, you can try the following commands:
    - `git checkout main && git fetch upstream && git rebase upstream/main`
-   - `git switch -c release/<release series>`
+   - `git switch -c release/<release series>` # append the commit hash of the PR in the last step if it is not the head of mainline
    - `git push -u upstream release/<release series>`
 
 5. Make sure you are on `release/<release-series>`. Tag the module groups with the new release version by running:
@@ -90,7 +90,7 @@ Before the release, make sure there are no open release blockers in [core](https
    new branch to `open-telemetry/opentelemetry-collector-contrib`. Assuming your
    upstream remote is named `upstream`, you can try the following commands:
    - `git checkout main && git fetch upstream && git rebase upstream/main`
-   - `git switch -c release/<release series>`
+   - `git switch -c release/<release series>` # append the commit hash of the PR in the last step if it is not the head of mainline
    - `git push -u upstream release/<release series>`
 
 4. Make sure you are on `release/<release-series>`. Tag all the module groups with the new release version by running:
@@ -234,8 +234,6 @@ Once a module is ready to be released under the `1.x` version scheme, file a PR
 
 | Date       | Version  | Release manager                                   |
 |------------|----------|---------------------------------------------------|
-| 2024-12-02 | v0.115.0 | [@atoulme](https://github.com/atoulme)            |
-| 2024-12-16 | v0.116.0 | [@songy23](https://github.com/songy23)            |
 | 2025-01-06 | v0.117.0 | [@dmitryax](https://github.com/dmitryax)          |
 | 2025-01-20 | v0.118.0 | [@codeboten](https://github.com/codeboten)        |
 | 2025-02-03 | v0.119.0 | [@bogdandrutu](https://github.com/bogdandrutu)    |
@@ -244,3 +242,5 @@ Once a module is ready to be released under the `1.x` version scheme, file a PR
 | 2025-03-17 | v0.122.0 | [@evan-bradley](https://github.com/evan-bradley)  |
 | 2025-03-31 | v0.123.0 | [@djaglowski](https://github.com/djaglowski)      |
 | 2025-04-14 | v0.124.0 | [@TylerHelmuth](https://github.com/TylerHelmuth)  |
+| 2025-04-28 | v0.125.0 | [@atoulme](https://github.com/atoulme)            |
+| 2025-05-12 | v0.126.0 | [@songy23](https://github.com/songy23)            |