docs: use #!/usr/bin/env bash instead of #!/bin/bash

.github/workflows/build_vinix_locally.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 

.github/workflows/freebsd_build_tcc.sh

@@ -1,4 +1,4 @@
-#!/usr/local/bin/bash
+#!/usr/bin/env bash
 
 ## should be run in V's main repo folder!
 

doc/docs.md

@@ -6231,7 +6231,7 @@ This is an example bash script you can use to optimize your CLI V program withou
 In most cases, you will need to change this script to make it suitable for your particular program.
 
 ```bash
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Get the full path to the current directory
 CUR_DIR=$(pwd)

doc/packaging_v_for_distributions.md

@@ -119,7 +119,7 @@ Example `v` script for your bin folder:
 --------------------------------------------------
 
 ```sh
-#!/bin/bash
+#!/usr/bin/env bash
 
 export VEXE="/opt/vlang/v"
 export VFLAGS="-cc /usr/bin/custom_cc"