docs(previewer): term_preview env option (#3226)

* docs(previewer): term_preview `env` option

* [docgen] Update doc/telescope.txt
skip-checks: true

---------

Co-authored-by: Github Actions <actions@github>

Author: jamestrew

doc/telescope.txt

@@ -3855,13 +3855,16 @@ previewers.new_termopen_previewer() *telescope.previewers.new_termopen_previewer
     - `title` a static title for example "File Preview"
     - `dyn_title(self, entry)` a dynamic title function which gets called when
       config value `dynamic_preview_title = true`
+    - `env` table: define environment variables to forward to the terminal 
+      process. Example:
+      - `{ ['PAGER'] = '', ['MANWIDTH'] = 50 }`
 
     It's an easy way to get your first previewer going and it integrates well
     with `bat` and `less`. Providing out of the box scrolling if the command
     uses less.
 
-    Furthermore, it will forward all `config.set_env` environment variables to
-    that terminal process.
+    Furthermore, if `env` is not set, it will forward all `config.set_env`
+    environment variables to that terminal process.
 
 
 

lua/telescope/previewers/init.lua

@@ -90,10 +90,10 @@ end
 --- Additionally you can define:
 --- - `title` a static title for example "File Preview"
 --- - `dyn_title(self, entry)` a dynamic title function which gets called
+--- when config value `dynamic_preview_title = true`
 --- - `env` table: define environment variables to forward to the terminal
 ---    process. Example:
 ---   - `{ ['PAGER'] = '', ['MANWIDTH'] = 50 }`
---- when config value `dynamic_preview_title = true`
 ---
 --- It's an easy way to get your first previewer going and it integrates well
 --- with `bat` and `less`. Providing out of the box scrolling if the command