(DOCSP-28788) Fixed the redirect for symlink for the stable branch to point to 1.19 (#1287)

Author: JuliaMongo

config/redirects

@@ -5,7 +5,7 @@ define: base https://www.mongodb.com/docs/kubernetes-operator
 define: versions v0.8 v0.9 v0.10 v0.11 v0.12 v1.0 v1.1 v1.2 v1.3 v1.4 v1.5 v1.6 v1.7 v1.8 v1.9 v1.10 v1.11 v1.12 v1.13 v1.14 v1.15 v1.16 v1.17 v1.18 v1.19 master
 symlink: v1.20 -> master
 symlink: upcoming -> master
-symlink: stable -> v1.18
+symlink: stable -> v1.19
 
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