fix: various typos (mdn#20327)

files/en-us/learn/mathml/first_steps/getting_started/index.md

@@ -101,7 +101,7 @@ You may also notice some subtle change in the appearance: the text and vertical
 
 > **Note:** This corresponds to the LaTeX's concept of _inline_ formulas (delimited by dollar signs `$...$`) and _display_ formulas (delimited by `\[...\]`).
 
-> **Note:** The appearance change mentioned above is actually controlled by the  [`math-style`](/en-US/docs/Web/CSS/math-style) property which is initally `normal` for `<math display="block">` and `compact` otherwise. In some MathML subtrees, this property can then automatically become `compact` but we will ignore this subtility for this introductory tutorial. Again, this is similar to LaTeX.
+> **Note:** The appearance change mentioned above is actually controlled by the  [`math-style`](/en-US/docs/Web/CSS/math-style) property which is initially `normal` for `<math display="block">` and `compact` otherwise. In some MathML subtrees, this property can then automatically become `compact` but we will ignore this subtlety for this introductory tutorial. Again, this is similar to LaTeX.
 
 ## Grouping with the \<mrow> element
 

files/en-us/learn/mathml/first_steps/scripts/index.md

@@ -366,7 +366,7 @@ math {
 
 {{ EmbedLiveSample('Stretching_in_horizontal_direction', 700, 200, "", "") }}
 
-We now realize that the bottom bracket "⎵" and the rightward arrow "→" stretch horizontally to cover the width of the substitued values. Recall that [some vertical operators can stretch](/en-US/docs/Learn/MathML/First_steps/Text_containers#active_learning_stretchy_operators) to cover the height of non-stretchy siblings inside an `<mrow>`. Similarly some horizontal operators can stretch to cover the width of non-stretchy siblings in an `<munder>`, `<mover>` or `<munderover>` element.
+We now realize that the bottom bracket "⎵" and the rightward arrow "→" stretch horizontally to cover the width of the substituted values. Recall that [some vertical operators can stretch](/en-US/docs/Learn/MathML/First_steps/Text_containers#active_learning_stretchy_operators) to cover the height of non-stretchy siblings inside an `<mrow>`. Similarly some horizontal operators can stretch to cover the width of non-stretchy siblings in an `<munder>`, `<mover>` or `<munderover>` element.
 
 > **Note:** Stretching can happen for any child of the `<munder>`, `<mover>` or `<munderover>` element, not just the underscript or overscript.
 

files/en-us/learn/mathml/first_steps/tables/index.md

@@ -219,7 +219,7 @@ This is again similar to [HTML tables](/en-US/docs/Learn/HTML/Tables/Basics#allo
 
 {{ EmbedLiveSample('allowing_cells_to_span_multiple_rows_and_columns', 700, 200, "", "") }}
 
-> **Note:** For historical reason, the MathML attribute for column spaning is called `columnspan` not `colspan`.
+> **Note:** For historical reason, the MathML attribute for column spanning is called `columnspan` not `colspan`.
 
 ## Usage for advanced layout
 

files/en-us/learn/mathml/index.md

@@ -31,7 +31,7 @@ Before attempting to learn MathML, it is assumed that you have some basic knowle
 - [Introduction to HTML](/en-US/docs/Learn/HTML/Introduction_to_HTML)
 - [Introduction to CSS](/en-US/docs/Learn/CSS/First_steps)
 
-Some familarity with mathematical notations and [TeX](https://fr.wikipedia.org/wiki/TeX) rendering rules might also come in handy, even though required concepts will be explained as needed.
+Some familiarity with mathematical notations and [TeX](https://fr.wikipedia.org/wiki/TeX) rendering rules might also come in handy, even though required concepts will be explained as needed.
 
 ## Modules