docs(snippets): mention how to interactively check context language

Author: echasnovski

doc/mini-snippets.txt

@@ -783,6 +783,8 @@ Parameters ~
     used to find snippet files, as in |MiniSnippets.gen_loader.from_runtime()|.
     Patterns will be processed in order. With |MiniSnippets.default_prepare()|
     it means if snippets have same prefix, data from later patterns is used.
+    To interactively check the current language with default context, execute
+    `:=MiniSnippets.default_prepare({})` and see data in the second table.
 
     Default pattern array (for non-empty language) is constructed as to read
     `*.json` and `*.lua` files that are:

lua/mini/snippets.lua

@@ -830,6 +830,8 @@ MiniSnippets.gen_loader = {}
 ---     used to find snippet files, as in |MiniSnippets.gen_loader.from_runtime()|.
 ---     Patterns will be processed in order. With |MiniSnippets.default_prepare()|
 ---     it means if snippets have same prefix, data from later patterns is used.
+---     To interactively check the current language with default context, execute
+---     `:=MiniSnippets.default_prepare({})` and see data in the second table.
 ---
 ---     Default pattern array (for non-empty language) is constructed as to read
 ---     `*.json` and `*.lua` files that are: