Add subtitle to docs and fix primitive type links (#6724)

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

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

@@ -1,17 +1,18 @@
 ---
-title: "std::math::atan"
+title: "atan"
+subtitle: "Function in math"
 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)
 ```
 
+Consider using `atan2()` instead for the true inverse of tangent.
+
 ### Arguments
 
 | Name | Type | Description | Required |

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

@@ -1,17 +1,18 @@
 ---
-title: "std::units::toCentimeters"
+title: "units::toCentimeters"
+subtitle: "Function in units"
 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 |

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

@@ -1,17 +1,18 @@
 ---
-title: "std::units::toFeet"
+title: "units::toFeet"
+subtitle: "Function in units"
 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 |

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

@@ -1,17 +1,18 @@
 ---
-title: "std::units::toInches"
+title: "units::toInches"
+subtitle: "Function in units"
 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 |

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

@@ -1,17 +1,18 @@
 ---
-title: "std::units::toMeters"
+title: "units::toMeters"
+subtitle: "Function in units"
 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 |

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

@@ -1,17 +1,18 @@
 ---
-title: "std::units::toMillimeters"
+title: "units::toMillimeters"
+subtitle: "Function in units"
 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 |

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

@@ -1,17 +1,18 @@
 ---
-title: "std::units::toYards"
+title: "units::toYards"
+subtitle: "Function in units"
 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 |