fix(docs): yarn1 does not need -W flag (#10419)

I tried omitting the flag and everything seemed to work fine.
if yarn2 needs this, it should be clarified which version  that it is talking about

docs/shared/core-tutorial/01-create-blog.md

@@ -48,7 +48,7 @@ Which tells yarn (or npm) and Nx to look in the `packages` folder for projects t
 To install Eleventy run:
 
 ```bash
-yarn add -D -W @11ty/eleventy@1.0.0
+yarn add -D @11ty/eleventy@1.0.0
 ```
 
 or
@@ -57,7 +57,7 @@ or
 npm add -D @11ty/eleventy@1.0.0
 ```
 
-Note: We are intentionally installing the package at the root of the workspace because this forces the organization to have the upfront cost of agreeing on the same versions of dependencies rather than the delayed cost of having projects using multiple different incompatible versions of dependencies. Yarn needs the `-W` flag so that you can install dependencies at the root. This is not a requirement of Nx, just a suggestion to help you maintain a growing repo.
+Note: We are intentionally installing the package at the root of the workspace because this forces the organization to have the upfront cost of agreeing on the same versions of dependencies rather than the delayed cost of having projects using multiple different incompatible versions of dependencies. This is not a requirement of Nx, just a suggestion to help you maintain a growing repo.
 
 **Eleventy Hello World**