Added some bindings to my vimrc

So, I added the following to my vimrc:

" Change Leader Key to a comma, that '\' is so hard to reach
let mapleader = ","

" Set the maximum width of text to 80 characters
set textwidth=80

" Optional visual indicator for the 80th column
set colorcolumn=80

" Show line numbers
set number

" File type detection, plugins, and smart indentation
filetype plugin indent on

" formatoptions settings:
" t: Auto-wrap text using textwidth
" c: Auto-wrap comments using textwidth
" q: Allow formatting of comments with "gq"
set formatoptions+=tcq

" Tabs and Spaces Setup
set expandtab     " Use spaces instead of tabs
set tabstop=4      " Number of spaces that a tab counts for
set shiftwidth=4   " Number of spaces to use for each step of autoindent
set softtabstop=4  " Number of spaces that a tab counts for while editing

" Enable syntax highlighting
syntax enable

" Always show the status line
set laststatus=2

" Define the format (File path, Modified flag, Type, Line/Col, Percentage)
set statusline=%f\ %m\ %y\ %=%l:%c\ %p%%
set statusline+=\ %{wordcount().words}\ words

" Enable spell check
set spell

" Spell check look and feel
hi clear SpellBad
hi SpellBad cterm=underline ctermfg=red ctermbg=NONE
hi SpellBad gui=undercurl

" ==============================================================================
" KEY MAPPINGS
" ==============================================================================

" Insert date with comment tag in INSERT mode
inoremap <C-d> <C-R>=strftime("# %a %b %d %I:%M:%S %p %Z %Y")<CR>

" Save file with Ctrl+S in INSERT mode
inoremap <C-s> <Esc>:w<CR>a

" Comment out a line of code with //
nnoremap <Leader>/ I// <Esc>

" Uncomment a single line in NORMAL mode
nnoremap <Leader>u :s/^\/\/ //e<CR>

" ==============================================================================
" LANGUAGE SPECIFIC SETTINGS & ABBREVIATIONS
" ==============================================================================

" Java specific rules
augroup java_settings
    autocmd!
    " Turn on C-indenting ONLY for Java files
    autocmd FileType java setlocal cindent
    autocmd FileType java iabbrev <buffer> pvm public static void main(String[] args) {<CR>}<Esc>O
    " Auto-close curly braces and drop to a new line
    autocmd FileType java inoremap {<CR> {<CR>}<Esc>O
augroup END

" Perl specific rules
augroup perl_settings
    autocmd!
    " Perl Header Template
    autocmd FileType perl iabbrev <buffer> perlheader #!/usr/bin/perl<CR>use strict;<CR>use warnings;<CR><CR>
    
    " Perl MySQL Connection Template (with safety paste toggle)
    autocmd FileType perl iabbrev <buffer> dbconnect <C-O>:set paste<CR>use DBI;<CR><CR>my $dsn = "DBI:mysql:database=dbname;host=localhost";<CR>my $user = "username";<CR>my $password = "password";<CR><CR>my $dbh = DBI->connect($dsn, $user, $password, { RaiseError => 1, AutoCommit => 1 })<CR>or die "Connection failed: " . DBI->errstr;<CR><C-O>:set nopaste<CR>
augroup END