[tools.jl] Fixed a typo in ttest docstring ✍

src/Tools/tools.jl

@@ -572,8 +572,8 @@ ttest(vec::AbstractVector{<:AbstractVector})
 ```
 
 Perform a one sample t-test of the null hypothesis that `n` values with mean `x̄` and sample \
-standard deviation stddev come from a distribution with mean ``μ\\_0`` against the alternative \
-hypothesis that the distribution does not have mean ``μ\\_0``. The t-test with 95% confidence \
+standard deviation stddev come from a distribution with mean ``μ_0`` against the alternative \
+hypothesis that the distribution does not have mean ``μ_0``. The t-test with 95% confidence \
 level applies on each pair of vectors in the `vec` vector. Each vector should contain the \
 Annual Percentage Yield (APY) of a different algorithm on various datasets.