sh-elf-vhex - v2.0.0-rc1 : hotfix curl operation + fix typo error

*fix*
> [project]
  | [readme] fix curl operation information
> [scripts]
  | [all] fix missing help message
  | [bootstrap] remove invalid use of `utils_callcmd()`

README.md

@@ -60,8 +60,9 @@ and [vxLibc](https://github.com/YannMagnin/vxLibc)
 
 The build is relatively simple and can be done in two different ways:
 
+Using `curl` and `jq`:
 ```bash
-curl -s "https://github.com/YannMagnin/sh-elf-vhex/+/HEAD/scripts/bootstrap.sh?format=TEXT" | base64 --decode | bash
+curl 'https://api.github.com/repos/YannMagnin/sh-elf-vhex/contents/scripts/bootstrap.sh' | jq -r '.content' | base64 --decode | bash
 ```
 
 Or by cloning the project and using the `bootstrap.sh` script, see

scripts/_install.sh

@@ -6,7 +6,7 @@
 
 function help() {
   cat << EOF
-Script for the installation step of binutils/GCC tools for the Vhex kernel.
+Script for the installation step of binutils/GCC tools for the Vhex project.
 
 Usage $0 [options...]
 

scripts/binutils/build.sh

@@ -6,7 +6,7 @@
 
 function help() {
   cat << EOF
-Script for the building step of binutils for the Vhex kernel.
+Script for the building step of binutils for the Vhex project.
 
 Usage $0 [options...]
 

scripts/bootstrap.sh

@@ -75,8 +75,7 @@ then
   fi
   [[ -d "$prefix_clone" ]] && rm -rf "$prefix_clone"
   echo '<sh-elf-vhex> self-clone repository...'
-  utils_callcmd \
-    git \
+  git \
     clone \
     --depth=1 \
     https://github.com/YannMagnin/sh-elf-vhex.git \

scripts/gcc/build.sh

@@ -6,7 +6,7 @@
 
 function help() {
   cat << EOF
-Script for the building step of GCC for the Vhex kernel.
+Script for the building step of GCC for the Vhex project
 
 Usage $0 [options...]
 

scripts/gcc/configure.sh

@@ -6,7 +6,7 @@
 
 function help() {
   cat << EOF
-Script for the configuration step of Vhex kernel's binutils.
+Script for the configuration step of Vhex's binutils.
 
 Usage $0 [options...]