Fix misspelling of word "Prerequisites".
In the step 5 of the Prerequisites section, the python command was missing
the "-r" option, what the command really meant was to install from the given
requirements file, so fix that.
Cc: sean.brogan@microsoft.com
Cc: Bret.Barkelew@microsoft.com
Cc: michael.d.kinney@intel.com
Cc: gaoliming@byosoft.com.cn
Signed-off-by: Chao Li <lichao@loongson.cn>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
that a few steps should be followed. Details of EDKII Tools can be found in the\r
[docs folder here](https://github.com/tianocore/edk2-pytool-extensions/tree/master/docs)\r
\r
-### Prerequisets\r
+### Prerequisites\r
\r
1. A supported toolchain (others might work but this is what is tested and validated)\r
* Windows 10:\r
2. Python 3.7.x or newer on path\r
3. git on path\r
4. Recommended to setup and activate a python virtual environment\r
-5. Install the requirements `pip install --upgrade pip-requirements.txt`\r
+5. Install the requirements `pip install --upgrade -r pip-requirements.txt`\r
\r
### Running CI\r
\r