Set the limit of characters to 200 and don't run the lint on private items unless config allows it

tests/ui/too_long_first_doc_paragraph-fix.fixed

@@ -4,5 +4,6 @@
 ///
 /// A much longer explanation that goes into a lot more detail about
 /// how the thing works, possibly with doclinks and so one,
-/// and probably spanning a many rows.
-struct Foo;
+/// and probably spanning a many rows. Blablabla, it needs to be over
+/// 200 characters so I needed to write something longeeeeeeer.
+pub struct Foo;

tests/ui/too_long_first_doc_paragraph-fix.rs

@@ -3,5 +3,6 @@
 /// A very short summary.
 /// A much longer explanation that goes into a lot more detail about
 /// how the thing works, possibly with doclinks and so one,
-/// and probably spanning a many rows.
-struct Foo;
+/// and probably spanning a many rows. Blablabla, it needs to be over
+/// 200 characters so I needed to write something longeeeeeeer.
+pub struct Foo;

tests/ui/too_long_first_doc_paragraph-fix.stderr

@@ -4,7 +4,8 @@ error: first doc comment paragraph is too long
 LL | / /// A very short summary.
 LL | | /// A much longer explanation that goes into a lot more detail about
 LL | | /// how the thing works, possibly with doclinks and so one,
-LL | | /// and probably spanning a many rows.
+LL | | /// and probably spanning a many rows. Blablabla, it needs to be over
+LL | | /// 200 characters so I needed to write something longeeeeeeer.
    | |_
    |
    = note: `-D clippy::too-long-first-doc-paragraph` implied by `-D warnings`

tests/ui/too_long_first_doc_paragraph.rs

@@ -19,7 +19,7 @@ impl Bar {}
 /// Nunc turpis nunc, lacinia
 /// a dolor in, pellentesque aliquet enim. Cras nec maximus sem. Mauris arcu libero,
 /// gravida non lacinia at, rhoncus eu lacus.
-enum Enum {
+pub enum Enum {
     A,
 }
 
@@ -27,7 +27,7 @@ enum Enum {
 /// ipsum dolor sit amet, consectetur adipiscing elit. Nunc turpis nunc, lacinia
 /// a dolor in, pellentesque aliquet enim. Cras nec maximus sem. Mauris arcu libero,
 /// gravida non lacinia at, rhoncus eu lacus.
-union Union {
+pub union Union {
     a: u8,
     b: u8,
 }
@@ -37,11 +37,17 @@ union Union {
 /// Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc turpis nunc, lacinia
 /// a dolor in, pellentesque aliquet enim. Cras nec maximus sem. Mauris arcu libero,
 /// gravida non lacinia at, rhoncus eu lacus.
-union Union2 {
+pub union Union2 {
     a: u8,
     b: u8,
 }
 
+// Should not warn! (not public)
+/// Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc turpis nunc, lacinia
+/// a dolor in, pellentesque aliquet enim. Cras nec maximus sem. Mauris arcu libero,
+/// gravida non lacinia at, rhoncus eu lacus.
+fn f() {}
+
 fn main() {
     // test code goes here
 }