docs: telescope.nvim spelling and grammar fixes (#2325)

Corrects the following issues:
- article agreement
- spelling

lua/telescope/previewers/init.lua

@@ -4,7 +4,7 @@
 ---@brief [[
 --- Provides a Previewer table that has to be implemented by each previewer.
 --- To achieve this, this module also provides two wrappers that abstract most
---- of the work and make it really easy create new previewers.
+--- of the work and make it really easy to create new previewers.
 ---   - `previewers.new_termopen_previewer`
 ---   - `previewers.new_buffer_previewer`
 ---
@@ -40,7 +40,7 @@ local previewers = {}
 ---
 --- What `:new` expects is listed below
 ---
---- The interface provides following set of functions. All of them, besides
+--- The interface provides the following set of functions. All of them, besides
 --- `new`, will be handled by telescope pickers.
 --- - `:new(opts)`
 --- - `:preview(entry, status)`
@@ -51,7 +51,7 @@ local previewers = {}
 --- `Previewer:new()` expects a table as input with following keys:
 ---   - `setup` function(self): Will be called the first time preview will be
 ---                           called.
----   - `teardown` function(self): Will be called on cleanup.
+---   - `teardown` function(self): Will be called on clean up.
 ---   - `preview_fn` function(self, entry, status): Will be called each time
 ---                                                 a new entry was selected.
 ---   - `title` function(self): Will return the static title of the previewer.
@@ -156,8 +156,8 @@ previewers.qflist = term_previewer.qflist
 ---     available in `self.state` in each `define_preview` call.
 ---   - `teardown = function(self)` (optional)
 ---     Will be called at the end, when the picker is being closed and is
----     meant to cleanup everything that was allocated by the previewer.
----     The `buffer_previewer` will automatically cleanup all created buffers.
+---     meant to clean up everything that was allocated by the previewer.
+---     The `buffer_previewer` will automatically clean up all created buffers.
 ---     So you only need to handle things that were introduced by you.
 ---   - `keep_last_buf = true` (optional)
 ---     Will not delete the last selected buffer. This would allow you to
@@ -167,7 +167,7 @@ previewers.qflist = term_previewer.qflist
 ---     `require('telescope.state').get_global_key("last_preview_bufnr")`
 ---   - `get_buffer_by_name = function(self, entry)`
 ---     Allows you to set a unique name for each buffer. This is used for
----     caching purpose. `self.state.bufname` will be nil if the entry was
+---     caching purposes. `self.state.bufname` will be nil if the entry was
 ---     never loaded or the unique name when it was loaded once. For example,
 ---     useful if you have one file but multiple entries. This happens for grep
 ---     and lsp builtins. So to make the cache work only load content if
@@ -258,7 +258,7 @@ previewers.vim_buffer_cat = buffer_previewer.cat
 --- case it's configured that way.
 previewers.vim_buffer_vimgrep = buffer_previewer.vimgrep
 
---- Is the same as `vim_buffer_vimgrep` and only exist for consistency with
+--- Is the same as `vim_buffer_vimgrep` and only exists for consistency with
 --- `term_previewers`.
 ---
 --- The preferred way of using this previewer is like this