Docs improvements (#6615)

Signed-off-by: Nick Cameron <nrc@ncameron.org>

docs/kcl/functions/std-math-atan.md

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+---
+title: "std::math::atan"
+excerpt: "Compute the arctangent of a number."
+layout: manual
+---
+
+Compute the arctangent of a number.
+
+Consider using `atan2()` instead for the true inverse of tangent.
+
+```kcl
+atan(@num: number(_)): number(rad)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(_)` |  | Yes |
+
+### Returns
+
+`number(rad)`
+
+
+### Examples
+
+```kcl
+sketch001 = startSketchOn(XZ)
+  |> startProfile(at = [0, 0])
+  |> angledLine(
+    angle = atan(1.25),
+    length = 20,
+  )
+  |> yLine(endAbsolute = 0)
+  |> close()
+
+extrude001 = extrude(sketch001, length = 5)
+```
+
+
+

docs/kcl/functions/std-units-toCentimeters.md

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+---
+title: "std::units::toCentimeters"
+excerpt: "Convert a number to centimeters from its current units."
+layout: manual
+---
+
+Convert a number to centimeters from its current units.
+
+
+
+```kcl
+units::toCentimeters(@num: number(cm)): number(cm)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(cm)` |  | Yes |
+
+### Returns
+
+`number(cm)`
+
+
+

docs/kcl/functions/std-units-toFeet.md

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+---
+title: "std::units::toFeet"
+excerpt: "Convert a number to feet from its current units."
+layout: manual
+---
+
+Convert a number to feet from its current units.
+
+
+
+```kcl
+units::toFeet(@num: number(ft)): number(ft)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(ft)` |  | Yes |
+
+### Returns
+
+`number(ft)`
+
+
+

docs/kcl/functions/std-units-toInches.md

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+---
+title: "std::units::toInches"
+excerpt: "Convert a number to inches from its current units."
+layout: manual
+---
+
+Convert a number to inches from its current units.
+
+
+
+```kcl
+units::toInches(@num: number(in)): number(in)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(in)` |  | Yes |
+
+### Returns
+
+`number(in)`
+
+
+

docs/kcl/functions/std-units-toMeters.md

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+---
+title: "std::units::toMeters"
+excerpt: "Convert a number to meters from its current units."
+layout: manual
+---
+
+Convert a number to meters from its current units.
+
+
+
+```kcl
+units::toMeters(@num: number(m)): number(m)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(m)` |  | Yes |
+
+### Returns
+
+`number(m)`
+
+
+

docs/kcl/functions/std-units-toMillimeters.md

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+---
+title: "std::units::toMillimeters"
+excerpt: "Convert a number to millimeters from its current units."
+layout: manual
+---
+
+Convert a number to millimeters from its current units.
+
+
+
+```kcl
+units::toMillimeters(@num: number(mm)): number(mm)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(mm)` |  | Yes |
+
+### Returns
+
+`number(mm)`
+
+
+

docs/kcl/functions/std-units-toYards.md

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+---
+title: "std::units::toYards"
+excerpt: "Converts a number to yards from its current units."
+layout: manual
+---
+
+Converts a number to yards from its current units.
+
+
+
+```kcl
+units::toYards(@num: number(yd)): number(yd)
+```
+
+
+### Arguments
+
+| Name | Type | Description | Required |
+|----------|------|-------------|----------|
+| `num` | `number(yd)` |  | Yes |
+
+### Returns
+
+`number(yd)`
+
+
+