fix(health): iterate using ipairs correctly (#22119)

In a few places ipairs was used to iterate over elements of the array.
However, the first return value of ipairs was erronously used, which is
not the value, but rather the index. This would result in errors, for
instance when trying to retrieve a field from the value.

runtime/lua/nvim/health.lua

@@ -183,7 +183,7 @@ local function check_rplugin_manifest()
     existing_rplugins[item.path] = 'python'
   end
 
-  for item in ipairs(vim.fn['remote#host#PluginsForHost']('python3')) do
+  for _, item in ipairs(vim.fn['remote#host#PluginsForHost']('python3')) do
     existing_rplugins[item.path] = 'python3'
   end
 
@@ -200,7 +200,7 @@ local function check_rplugin_manifest()
     local scripts = vim.fn.glob(python_dir .. '/*.py', true, true)
     vim.list_extend(scripts, vim.fn.glob(python_dir .. '/*/__init__.py', true, true))
 
-    for script in ipairs(scripts) do
+    for _, script in ipairs(scripts) do
       local contents = vim.fn.join(vim.fn.readfile(script))
       if vim.regex([[\<\%(from\|import\)\s\+neovim\>]]):match_str(contents) then
         if vim.regex([[[\/]__init__\.py$]]):match_str(script) then
@@ -384,7 +384,13 @@ local function check_terminal()
     )
   end
 
-  for env_var in ipairs({ 'XTERM_VERSION', 'VTE_VERSION', 'TERM_PROGRAM', 'COLORTERM', 'SSH_TTY' }) do
+  for _, env_var in ipairs({
+    'XTERM_VERSION',
+    'VTE_VERSION',
+    'TERM_PROGRAM',
+    'COLORTERM',
+    'SSH_TTY',
+  }) do
     if vim.env[env_var] then
       health.report_info(vim.fn.printf('$%s="%s"', env_var, vim.env[env_var]))
     end