Standardize headers in docstrings

Author: juliohm

src/transforms/absoluteunits.jl

@@ -18,7 +18,7 @@ Converts the units of selected columns `col₁`, `col₂`, ..., `colₙ` to abso
 
 Converts the units of columns that match with `regex` to absolute units.
 
-# Examples
+## Examples
 
 ```julia
 AbsoluteUnits()

src/transforms/assert.jl

@@ -21,7 +21,7 @@ Asserts the selected columns `col₁`, `col₂`, ..., `colₙ`.
 
 Asserts the columns that match with `regex`.
 
-# Examples
+## Examples
 
 ```julia
 Assert(cond=allunique, msg="assertion error")

src/transforms/center.jl

@@ -19,7 +19,8 @@ Applies the Center transform on columns `col₁`, `col₂`, ..., `colₙ`.
 
 Applies the Center transform on columns that match with `regex`.
 
-# Examples
+## Examples
+
 ```julia
 Center(1, 3, 5)
 Center([:a, :c, :e])

src/transforms/coalesce.jl

@@ -19,7 +19,7 @@ Replaces all missing values from the columns
 Replaces all missing values from the columns
 that match with `regex` with `value`.
 
-# Examples
+## Examples
 
 ```julia
 Coalesce(value=0)

src/transforms/coerce.jl

@@ -13,7 +13,7 @@ Coerce all columns of the table with scientific type `S`.
 
 This transform uses the `DataScienceTraits.coerce` function. Please see their docstring for more details.
 
-# Examples
+## Examples
 
 ```julia
 using DataScienceTraits

src/transforms/compose.jl

@@ -18,7 +18,7 @@ Converts the selected columns `col₁`, `col₂`, ..., `colₙ` into parts of a
 
 Converts the columns that match with `regex` into parts of a composition.
 
-# Examples
+## Examples
 
 ```julia
 Compose(as=:composition)

src/transforms/dropextrema.jl

@@ -20,7 +20,7 @@ are outside the interval.
 Drops rows where any of the values in columns that match with `regex`
 are outside the interval.
 
-# Examples
+## Examples
 
 ```julia
 DropExtrema(low=0.3, high=0.7)

src/transforms/dropmissing.jl

@@ -18,7 +18,7 @@ Drop all rows with missing values in selected columns `col₁`, `col₂`, ..., `
 
 Drop all rows with missing values in columns that match with `regex`.
 
-# Examples
+## Examples
 
 ```julia
 DropMissing()

src/transforms/dropnan.jl

@@ -18,7 +18,7 @@ Drop all rows with NaN values in selected columns `col₁`, `col₂`, ..., `col
 
 Drop all rows with NaN values in columns that match with `regex`.
 
-# Examples
+## Examples
 
 ```julia
 DropNaN(2, 3, 4)

src/transforms/dropunits.jl

@@ -18,7 +18,7 @@ Drop units from selected columns `col₁`, `col₂`, ..., `colₙ`.
 
 Drop units from columns that match with `regex`.
 
-# Examples
+## Examples
 
 ```julia
 DropUnits()