[CI:DOCS] Touch up changelogs

The changelog.txt and CHANGELOG.md files each had "vv1.37" instead of
"v1.37".  This corrects that.

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>

Author: TomSweeneyRedHat

CHANGELOG.md

@@ -123,7 +123,7 @@
     Add PrependedLinkedLayers/AppendedLinkedLayers to CommitOptions
     integration tests: teach starthttpd() about TLS and pid files
 
-## vv1.37.0 (2024-07-26)
+## v1.37.0 (2024-07-26)
 
     Bump c/storage, c/image, c/common for v1.37.0
     "build with basename resolving user arg" tests: correct ARG use

changelog.txt

@@ -118,7 +118,7 @@
   * Add PrependedLinkedLayers/AppendedLinkedLayers to CommitOptions
   * integration tests: teach starthttpd() about TLS and pid files
 
-- Changelog for vv1.37.0 (2024-07-26)
+- Changelog for v1.37.0 (2024-07-26)
   * Bump c/storage, c/image, c/common for v1.37.0
   * "build with basename resolving user arg" tests: correct ARG use
   * bud-multiple-platform-no-run test: correct ARG use