Update en-us and fr-fr versions of the "Upgrade from Gogs" doc (#4618)

* Update "Upgrade from Gogs" en-us doc

- Move "Change gogs specific information" FROM/TO steps up
  to just beneath matching section header, adjust indention
  and explicitly specify syntax of code sample to provide
  highlighting

- Adjust header levels to match what appears to be the
  intended level, remove trailing decoration (see below)

- Move "Upgrading to most recent ..." section down, remove
  decoration (section header formatting likely covers this
  well enough already)

refs go-gitea/gitea#4286, go-gitea/gitea#3558

* Update "Upgrade from Gogs" fr-fr doc

- Adjust indention and explicitly specify syntax of code
  sample to provide highlighting

- Adjust header levels to match what appears to be the
  intended level, remove trailing decoration since
  section header formatting likely covers this
  well enough already

refs go-gitea/gitea#4286, go-gitea/gitea#3558

docs/content/doc/upgrade/from-gogs.en-us.md

@@ -33,19 +33,15 @@ There are some basic steps to follow. On a Linux system run as the Gogs user:
 * Enter Gitea admin panel on the UI, run `Rewrite '.ssh/authorized_keys' file`.
 * If custom or config path was changed, run `Rewrite all update hook of repositories`.
 
-### Change gogs specific information:
+## Change gogs specific information
 
 * Rename `gogs-repositories/` to `gitea-repositories/`
 * Rename `gogs-data/` to `gitea-data/`
 * In `gitea/custom/conf/app.ini` change:
 
-### Upgrading to most recent `gitea` version:
-After successful migration from `gogs` to `gitea 1.0.x` it is possible to upgrade to the recent `gitea` version.
-Simply download the file matching the destination platform from the [downloads page](https://dl.gitea.io/gitea)
-and replace the binary.
-
   FROM:
-```
+
+  ```ini
   [database]
   PATH = /home/:USER/gogs/data/:DATABASE.db
   [attachment]
@@ -57,7 +53,8 @@ ROOT_PATH = /home/:USER/gogs/log
   ```
 
   TO:
-```
+
+  ```ini
   [database]
   PATH = /home/:USER/gitea/data/:DATABASE.db
   [attachment]
@@ -70,13 +67,19 @@ ROOT_PATH = /home/:USER/gitea/log
 
 * Verify by starting Gitea with `gitea web`
 
-### Troubleshooting
+## Upgrading to most recent `gitea` version
+
+After successful migration from `gogs` to `gitea 1.0.x` it is possible to upgrade to the recent `gitea` version.
+Simply download the file matching the destination platform from the [downloads page](https://dl.gitea.io/gitea)
+and replace the binary.
+
+## Troubleshooting
 
 * If errors are encountered relating to custom templates in the `gitea/custom/templates`
   folder, try moving the templates causing the errors away one by one. They may not be
   compatible with Gitea or an update.
 
-### Add Gitea to startup on Unix
+## Add Gitea to startup on Unix
 
 Update the appropriate file from [gitea/contrib](https://github.com/go-gitea/gitea/tree/master/contrib)
 with the right environment variables.

docs/content/doc/upgrade/from-gogs.fr-fr.md

@@ -29,14 +29,15 @@ Veuillez suivre les étapes ci-dessous. Sur Unix, toute les commandes s'exécute
 * Vérifiez votre installation en exécutant Gitea avec la commande `gitea web`.
 * Connectez vous au panel d'administration de Gitea et exécutez l'action `Rewrite '.ssh/authorized_keys' file`, puis l'action `Rewrite all update hook of repositories` (obligatoire si le chemin menant à votre configuration personnalisée à changé).
 
-### Modifier les informations spécifiques de gogs
+## Modifier les informations spécifiques de gogs
 
 * Renommez `gogs-repositories/` vers `gitea-repositories/`
 * Renommez `gogs-data/` to `gitea-data/`
 * Dans votre fichier `gitea/custom/conf/app.ini`, modifiez les éléments suivants:
 
   DE :
-```
+
+  ```ini
   [database]
   PATH = /home/:USER/gogs/data/:DATABASE.db
   [attachment]
@@ -48,7 +49,8 @@ ROOT_PATH = /home/:USER/gogs/log
   ```
 
   VERS :
-```
+
+  ```ini
   [database]
   PATH = /home/:USER/gitea/data/:DATABASE.db
   [attachment]
@@ -61,11 +63,11 @@ ROOT_PATH = /home/:USER/gitea/log
 
 * Vérifiez votre installation en exécutant Gitea avec la commande `gitea web`.
 
-### Dépannage
+## Dépannage
 
 * Si vous rencontrez des erreurs relatives à des modèles personnalisés dans le dossier `gitea/custom/templates`, essayez de déplacer un par un les modèles provoquant les erreurs. Il est possible qu'ils ne soient pas compatibles avec Gitea.
 
-### Démarrer automatiquement Gitea (Unix)
+## Démarrer automatiquement Gitea (Unix)
 
 Distributions utilisant systemd: