Fix capitalization in provider doc titlesand refs

Author: vishaangelova

reference/fleet/docker-provider.md

@@ -8,7 +8,7 @@ products:
   - id: elastic-agent
 ---
 
-# Docker Provider [docker-provider]
+# Docker provider [docker-provider]
 
 Provides inventory information from Docker. The available dynamic variables are:
 

reference/fleet/env-provider.md

@@ -8,7 +8,7 @@ products:
   - id: elastic-agent
 ---
 
-# Env Provider [env-provider]
+# Env provider [env-provider]
 
 Provides access to the environment variables as key-value pairs.
 

reference/fleet/kubernetes-provider.md

@@ -8,7 +8,7 @@ products:
   - id: elastic-agent
 ---
 
-# Kubernetes Provider [kubernetes-provider]
+# Kubernetes provider [kubernetes-provider]
 
 Provides inventory information from Kubernetes.
 

reference/fleet/kubernetes_secrets-provider.md

@@ -8,7 +8,7 @@ products:
   - id: elastic-agent
 ---
 
-# Kubernetes Secrets Provider [kubernetes_secrets-provider]
+# Kubernetes Secrets provider [kubernetes_secrets-provider]
 
 Provides access to the Kubernetes Secrets API.
 

reference/fleet/local-provider.md

@@ -8,7 +8,7 @@ products:
   - id: elastic-agent
 ---
 
-# Local [local-provider]
+# Local provider [local-provider]
 
 Provides custom keys to use as variables. For example:
 

reference/fleet/providers.md

@@ -76,12 +76,12 @@ Context providers use the {{product.ecs}} naming to ensure consistency and under
 
 {{agent}} supports the following context providers:
 
-* [Local](/reference/fleet/local-provider.md)
-* [Agent Provider](/reference/fleet/agent-provider.md)
-* [Host Provider](/reference/fleet/host-provider.md)
-* [Env Provider](/reference/fleet/env-provider.md)
-* [Kubernetes Secrets Provider](/reference/fleet/kubernetes_secrets-provider.md)
-* [Kubernetes Leader Election Provider](/reference/fleet/kubernetes_leaderelection-provider.md)
+* [Local provider](/reference/fleet/local-provider.md)
+* [Agent provider](/reference/fleet/agent-provider.md)
+* [Host provider](/reference/fleet/host-provider.md)
+* [Env provider](/reference/fleet/env-provider.md)
+* [Kubernetes Secrets provider](/reference/fleet/kubernetes_secrets-provider.md)
+* [Kubernetes LeaderElection provider](/reference/fleet/kubernetes_leaderelection-provider.md)
 
 
 ### Dynamic Providers [dynamic-providers]
@@ -90,9 +90,9 @@ Dynamic providers give an array of multiple key-value mappings. Each key-value m
 
 {{agent}} supports the following context providers:
 
-* [Local Dynamic Provider](/reference/fleet/local-dynamic-provider.md)
-* [Docker Provider](/reference/fleet/docker-provider.md)
-* [Kubernetes Provider](/reference/fleet/kubernetes-provider.md)
+* [Local dynamic provider](/reference/fleet/local-dynamic-provider.md)
+* [Docker provider](/reference/fleet/docker-provider.md)
+* [Kubernetes provider](/reference/fleet/kubernetes-provider.md)
 
 
 ### Disabling Providers By Default [disable-providers-by-default]