Standardize and order the .gitattributes file (#48764)

Author: jbampton

.gitattributes

@@ -1,5 +1,6 @@
-clients export-ignore
 chart/charts/** export-ignore
+clients export-ignore
+contributing-docs/ export-ignore
 dev export-ignore
 devel-common export-ignore
 docker-context-files export-ignore
@@ -12,22 +13,20 @@ newsfragments export-ignore
 scripts export-ignore
 
 Dockerfile.ci export-ignore
-
-ISSUE_TRIAGE_PROCESS.rst export-ignore
 CONTRIBUTING.rst export-ignore
-contributing-docs/ export-ignore
+ISSUE_TRIAGE_PROCESS.rst export-ignore
 
+.asf.yaml export-ignore
+.bash_completion export-ignore
+.codespellignorelines export-ignore
 .devcontainer export-ignore
-.github export-ignore
-.readthedocs.yml export-ignore
-.hadolint.yaml export-ignore
-.pre-commit-config.yaml export-ignore
-.mailmap export-ignore
 .editorconfig export-ignore
-.inputrc export-ignore
-.codespellignorelines export-ignore
+.github export-ignore
 .gitmodules export-ignore
 .gitpod.yml export-ignore
+.hadolint.yaml export-ignore
+.inputrc export-ignore
+.mailmap export-ignore
 .markdownlint.yml export-ignore
-.bash_completion export-ignore
-.asf.yaml export-ignore
+.pre-commit-config.yaml export-ignore
+.readthedocs.yml export-ignore