rename files that contain a period

Author: colleenmcginnis

docs/reference/toc.yml

@@ -28,6 +28,6 @@ toc:
   - file: performance-tuning.md
   - file: upgrading.md
     children:
-      - file: upgrading-6.x.md
-      - file: upgrading-5.x.md
-      - file: upgrading-4.x.md
+      - file: upgrading-6-x.md
+      - file: upgrading-5-x.md
+      - file: upgrading-4-x.md

docs/reference/upgrading-4.x.md renamed to docs/reference/upgrading-4-x.md

@@ -1,18 +1,18 @@
 ---
 mapped_pages:
-  - https://www.elastic.co/guide/en/apm/agent/python/current/upgrading-4.x.html
+  - https://www.elastic.co/guide/en/apm/agent/python/current/upgrading-4-x.html
 ---
 
-# Upgrading to version 4 of the agent [upgrading-4.x]
+# Upgrading to version 4 of the agent [upgrading-4-x]
 
 4.0 of the Elastic APM Python Agent comes with several backwards incompatible changes.
 
-## APM Server 6.5 required [upgrading-4.x-apm-server]
+## APM Server 6.5 required [upgrading-4-x-apm-server]
 
 This version of the agent is **only compatible with APM Server 6.5+**. To upgrade, we recommend to first upgrade APM Server, and then the agent. APM Server 6.5+ is backwards compatible with versions 2.x and 3.x of the agent.
 
 
-## Configuration options [upgrading-4.x-configuration]
+## Configuration options [upgrading-4-x-configuration]
 
 Several configuration options have been removed, or renamed
 
@@ -22,7 +22,7 @@ Several configuration options have been removed, or renamed
 * Some settings now require a unit for duration or size. See [size format](configuration.md#config-format-size) and [duration format](configuration.md#config-format-duration).
 
 
-## Processors [upgrading-4.x-processors]
+## Processors [upgrading-4-x-processors]
 
 The method to write processors for sanitizing events has been changed. It will now be called for every type of event (transactions, spans and errors), unless the event types are limited using a decorator. See [Sanitizing data](sanitizing-data.md) for more information.
 

docs/reference/upgrading-5.x.md renamed to docs/reference/upgrading-5-x.md

@@ -1,9 +1,9 @@
 ---
 mapped_pages:
-  - https://www.elastic.co/guide/en/apm/agent/python/current/upgrading-5.x.html
+  - https://www.elastic.co/guide/en/apm/agent/python/current/upgrading-5-x.html
 ---
 
-# Upgrading to version 5 of the agent [upgrading-5.x]
+# Upgrading to version 5 of the agent [upgrading-5-x]
 
 ## APM Server 7.3 required for some features [_apm_server_7_3_required_for_some_features]
 

docs/reference/upgrading-6.x.md renamed to docs/reference/upgrading-6-x.md

@@ -1,9 +1,9 @@
 ---
 mapped_pages:
-  - https://www.elastic.co/guide/en/apm/agent/python/current/upgrading-6.x.html
+  - https://www.elastic.co/guide/en/apm/agent/python/current/upgrading-6-x.html
 ---
 
-# Upgrading to version 6 of the agent [upgrading-6.x]
+# Upgrading to version 6 of the agent [upgrading-6-x]
 
 ## Python 2 no longer supported [_python_2_no_longer_supported]