updates indentation yaml parsing on release notes

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#### What type of PR is this:
 cleanup, Part 2 of PR kubernetes#2073 (issue #2753)
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#### What this PR does / why we need it:
temp fix/workaround for when `krel` issue with release notes that start with backticks [issue incoming] 
#### Which issue(s) this PR fixes:

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#### Special notes for your reviewer:
similar issue fixed in the [past](kubernetes#1974)

releases/release-1.26/release-notes/maps/pr-112386-map.yaml

@@ -1,5 +1,5 @@
 pr: 112386
 releasenote:
   text: |
-  `CSRDuration` feature gate that graduated to GA in 1.24 and is unconditionally
-    enabled now removed in v1.26.
+      `CSRDuration` feature gate that graduated to GA in 1.24 and is unconditionally
+      enabled now removed in v1.26.