[brand] SearXNG - docs rename links and fix documentation

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

docs/admin/engines/settings.rst

@@ -94,7 +94,7 @@ Global Settings
        port: 8888
        bind_address: "127.0.0.1"      # address to listen on
        secret_key: "ultrasecretkey"   # change this!
-       image_proxy: false             # proxying image results through searx
+       image_proxy: false             # proxying image results through SearXNG
        default_locale: ""             # default interface locale
        default_theme: oscar           # ui theme
        default_http_headers:
@@ -293,7 +293,7 @@ engine is shown.  Most of the options have a default value or even are optional.
 
 ``timeout`` : optional
   Timeout of the search with the current search engine.  **Be careful, it will
-  modify the global timeout of searx.**
+  modify the global timeout of SearXNG.**
 
 ``api_key`` : optional
   In a few cases, using an API needs the use of a secret key.  How to obtain them

docs/admin/engines/sql-engines.rst

@@ -127,7 +127,7 @@ find an example configuration below:
    - name: my_database
      engine: postgresql
      database: my_database
-     username: searx
+     username: searxng
      password: password
      query_str: 'SELECT * from my_table WHERE my_column = %(query)s'
 
@@ -155,7 +155,7 @@ example configuration for quering a MySQL server:
    - name: my_database
      engine: mysql_server
      database: my_database
-     username: searx
+     username: searxng
      password: password
      limit: 5
      query_str: 'SELECT * from my_table WHERE my_column=%(query)s'