fixed typos in README

Author: chmerdon

README.md

@@ -61,11 +61,11 @@ plot([id(u), grid(u)], sol; Plotter = PythonPlot)
 ## Running examples from documentation
 
 In the [documentation](https://wias-pdelib.github.io/ExtendableFEM.jl/stable/index.html) many more examples can be found.
-Each of the examples is implemented as a module that needs to be included first. Afterwards the main file of the module
+Each of these examples is implemented as a module that needs to be included first. Afterwards the main file of the module
 can be run.
-Usually the main function has a Plotter argument that can be used to toggle a plot the solution with the (already installed) backend of your
-choice (e.g. `Plotter=PythonPlot`, `GLMakie`, `Plots` or others supported by [GridVisualize.jl](https://github.com/WIAS-PDELib/GridVisualize.jl)).
-Some examples need several further dependencies. To ensure an environment we everything is installed, one can use the test
+Usually the main function has a Plotter argument that can be used to toggle a plot of the solution with an
+(already installed) backend of your choice (e.g. `Plotter=PythonPlot`, `GLMakie`, `Plots` or others supported by [GridVisualize.jl](https://github.com/WIAS-PDELib/GridVisualize.jl)).
+Some examples need several further dependencies. To ensure an environment were every dependency is installed, one can use the test
 environment via the package [TestEnv](https://github.com/JuliaTesting/TestEnv.jl). The following script runs Example201:
 ```julia
 # activate test environment
@@ -78,7 +78,7 @@ include("examples/Example201_PoissonProblem.jl")
 # run example with default arguments
 Example201_PoissonProblem.main()
 
-# use with Plotting backend (added manually to the environment)
+# run with Plotting backend (added manually to the environment)
 using PythonPlot
 Example201_PoissonProblem.main(; Plotter = PythonPlot)
 ```