Update bad references to kerning term (#7607)

* Remove glossary term `ehlt_axis`

The thumbnail needs to be converted to an SVG. Axis will be restored with a corrected thumbnail in a subsequent PR.

* Update bad references to `kerning` term

Glossary term for kerning is under `kerning_kerning_pairs`, not `kerning`.

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Co-authored-by: nathan-williams <nlw2sx@virginia.edu>

cc-by-sa/knowledge/glossary/terms/bled_axis/content.md

@@ -1,5 +1,5 @@
 
-“Bleed” (`BLED` in CSS) is an [axis](/glossary/axis_in_variable_fonts) found in some [variable fonts](/glossary/variable_fonts) that can be used to adjust the text’s overall darkness or [typographic color](/glossary/color) by altering its [glyphs](/glossary/glyph)’ shapes such as [strokes](/glossary/stroke) (or other forms). Because it’s only the individual shapes that are changed, there are no changes to the type’s overall [width](/glossary/width), [letter spacing](/glossary/tracking_letter_spacing), or [kerning](/glossary/kerning). Therefore, manipulating this axis will not result in altered line breaks or page layout changes.
+“Bleed” (`BLED` in CSS) is an [axis](/glossary/axis_in_variable_fonts) found in some [variable fonts](/glossary/variable_fonts) that can be used to adjust the text’s overall darkness or [typographic color](/glossary/color) by altering its [glyphs](/glossary/glyph)’ shapes such as [strokes](/glossary/stroke) (or other forms). Because it’s only the individual shapes that are changed, there are no changes to the type’s overall [width](/glossary/width), [letter spacing](/glossary/tracking_letter_spacing), or [kerning](/glossary/kerning_kerning_pairs). Therefore, manipulating this axis will not result in altered line breaks or page layout changes.
 
 The [Google Fonts CSS v2 API](https://developers.google.com/fonts/docs/css2) defines the axis as:
 
@@ -15,4 +15,4 @@ The [Google Fonts CSS v2 API](https://developers.google.com/fonts/docs/css2) def
 
 <figcaption>In the [Workbench](https://fonts.google.com/specimen/Workbench) typeface, note how moving the Bleed axis towards its maximum value expands the width of each individual scanline without altering the actual glyph width or spacing of the letters.</figcaption>
 
-Negative values make the text appear lighter, while positive values make it darker, similarly to the effects of ink bleed or dot gain on paper.
+Negative values make the text appear lighter, while positive values make it darker, similarly to the effects of ink bleed or dot gain on paper.

cc-by-sa/knowledge/glossary/terms/scan_axis/content.md

@@ -1,5 +1,5 @@
 
-“Scanlines” (`SCAN` in CSS) is an [axis](/glossary/axis_in_variable_fonts) found in some [variable fonts](/glossary/variable_fonts) that control the thickness of the scanlines that make up the [glyph](/glossary/glyph) shapes. Because it’s only the scanlines that are changed, there are no changes to the type’s overall [width](/glossary/width), [letter spacing](/glossary/tracking_letter_spacing), or [kerning](/glossary/kerning). Therefore, Manipulating this axis will not result in altered line breaks or page layout changes.
+“Scanlines” (`SCAN` in CSS) is an [axis](/glossary/axis_in_variable_fonts) found in some [variable fonts](/glossary/variable_fonts) that control the thickness of the scanlines that make up the [glyph](/glossary/glyph) shapes. Because it’s only the scanlines that are changed, there are no changes to the type’s overall [width](/glossary/width), [letter spacing](/glossary/tracking_letter_spacing), or [kerning](/glossary/kerning_kerning_pairs). Therefore, Manipulating this axis will not result in altered line breaks or page layout changes.
 
 The [Google Fonts CSS v2 API](https://developers.google.com/fonts/docs/css2) defines the axis as:
 
@@ -15,4 +15,4 @@ The [Google Fonts CSS v2 API](https://developers.google.com/fonts/docs/css2) def
 
 <figcaption>In the [Workbench](https://fonts.google.com/specimen/Workbench) typeface, note how moving the Scanline axis towards its maximum value expands the height of each individual scanline.</figcaption>
 
-Negative values make the scanlines thinner, and positive values make them thicker.
+Negative values make the scanlines thinner, and positive values make them thicker.