doc: tweaks. (#20557)

Author: kaos

docs/docs/python/overview/pex.mdx

@@ -87,7 +87,8 @@ In these cases you can override the default shebang using the [`shebang`](../../
 
 Pants makes use of the [Pex](https://github.com/pex-tool/pex) command-line tool internally for building PEXes. The Pex version that Pants uses is specified by the `version` option under the `pex-cli` subsystem. The known Pex versions are specified by the `known_versions` option under the `pex-cli` subsystem. You can see all Pex tool options and their current values by running `pants help-advanced pex-cli`. To upgrade the Pex version, update these option values accordingly. For instance, in `pants.toml`, to upgrade to Pex 2.1.143:
 
-```[pex-cli]
+```
+[pex-cli]
 version = "v2.1.143"
 known_versions = [
   "v2.1.143|macos_arm64|7dba8776000b4f75bc9af850cb65b2dc7720ea211733e8cb5243c0b210ef3c19|4194291",
@@ -101,6 +102,7 @@ The Pex version determines which Pip versions are supported. To see the lists of
 
 The Pip version that Pex uses is determined by the `pip_version` option in Pants. To upgrade the Pip version, update this option value accordingly. For instance, in `pants.toml`, to set the Pip version to be the latest supported by Pex:
 
-```[python]
+```
+[python]
 pip_version = "latest"
 ```

docs/docs/using-pants/key-concepts/options.mdx

@@ -105,9 +105,8 @@ repo_host = "repo.%(domain)s"
 indexes.add = ["https://%(env.PY_REPO)s@%(repo_host)s/index"]
 ```
 
-Learn more about exporting environment variables in the
-[`.pants.bootstrap`](../using-pants/key-concepts/options.mdx#pantsbootstrap-file)) Bash script that is sourced
-before Pants runs.
+Learn more about exporting environment variables in the [`.pants.bootstrap`](#pantsbootstrap-file))
+Bash script that is sourced before Pants runs.
 
 ## Option types