doc(releasing): Fixing markdown.

Remove unbreakable spaces, and add indentations.

RELEASING.md

@@ -13,35 +13,36 @@ The procedure is as follows:
 
 1. Switch to a release branch:
 
-  ```bash
-  git switch -c release-x.y.z
-  ```
+   ```bash
+   git switch -c release-x.y.z
+   ```
 
 2. Prepare the release. This will update the `README.md`, set the versions in
    the `CHANGELOG.md` file, and bump the version in the `Cargo.toml` file.
 
-```bash
-cargo xtask release prepare --execute minor|patch|rc
-```
+   ```bash
+   cargo xtask release prepare --execute minor|patch|rc
+   ```
 
 3. Double-check and edit the `CHANGELOG.md` and `README.md` if necessary. Once you are
    satisfied, push the branch and open a PR.
 
-```bash
-git push --set-upstream origin/release-x.y.z
-```
+   ```bash
+   git push --set-upstream origin/release-x.y.z
+   ```
 
 4. Pass the review and merge the branch as you would with any other branch.
 
 5. Create tags for your new release, publish the release on crates.io and push
    the tags:
 
-```bash
-# Switch to main first.
-git switch main
-# Pull in the now-merged release commit(s).
-git pull
-# Create tags, publish the release on crates.io, and push the tags.
-cargo xtask release publish --execute
-```
-For more information on cargo-release: https://github.com/crate-ci/cargo-release
+   ```bash
+   # Switch to main first.
+   git switch main
+   # Pull in the now-merged release commit(s).
+   git pull
+   # Create tags, publish the release on crates.io, and push the tags.
+   cargo xtask release publish --execute
+   ```
+
+   For more information on cargo-release: https://github.com/crate-ci/cargo-release