context: Improve rustdocs

Improve the rustdocs in the `schnorr` module by doing:

- Use third person tense
- Add full stops
- Use links and code ticks

src/context.rs

@@ -71,10 +71,10 @@ pub unsafe trait Context: private::Sealed {
     unsafe fn deallocate(ptr: *mut u8, size: usize);
 }
 
-/// Marker trait for indicating that an instance of `Secp256k1` can be used for signing.
+/// Marker trait for indicating that an instance of [`Secp256k1`] can be used for signing.
 pub trait Signing: Context {}
 
-/// Marker trait for indicating that an instance of `Secp256k1` can be used for verification.
+/// Marker trait for indicating that an instance of [`Secp256k1`] can be used for verification.
 pub trait Verification: Context {}
 
 /// Represents the set of capabilities needed for signing (preallocated memory).
@@ -239,8 +239,8 @@ mod alloc_only {
     impl Secp256k1<VerifyOnly> {
         /// Creates a new Secp256k1 context that can only be used for verification.
         ///
-        /// If `rand-std` feature is enabled, context will have been randomized using `thread_rng`.
-        /// If `rand-std` feature is not enabled please consider randomizing the context (see docs
+        /// * If `rand-std` feature is enabled, context will have been randomized using `thread_rng`.
+        /// * If `rand-std` feature is not enabled please consider randomizing the context (see docs
         /// for `Secp256k1::gen_new()`).
         pub fn verification_only() -> Secp256k1<VerifyOnly> { Secp256k1::gen_new() }
     }
@@ -299,7 +299,7 @@ unsafe impl<'buf> Context for AllPreallocated<'buf> {
 }
 
 impl<'buf, C: Context + 'buf> Secp256k1<C> {
-    /// Lets you create a context with a preallocated buffer in a generic manner(sign/verify/all).
+    /// Lets you create a context with a preallocated buffer in a generic manner (sign/verify/all).
     pub fn preallocated_gen_new(buf: &'buf mut [AlignedType]) -> Result<Secp256k1<C>, Error> {
         #[cfg(target_arch = "wasm32")]
         ffi::types::sanity_checks_for_wasm();
@@ -321,7 +321,7 @@ impl<'buf, C: Context + 'buf> Secp256k1<C> {
 }
 
 impl<'buf> Secp256k1<AllPreallocated<'buf>> {
-    /// Creates a new Secp256k1 context with all capabilities
+    /// Creates a new Secp256k1 context with all capabilities.
     pub fn preallocated_new(
         buf: &'buf mut [AlignedType],
     ) -> Result<Secp256k1<AllPreallocated<'buf>>, Error> {
@@ -330,7 +330,7 @@ impl<'buf> Secp256k1<AllPreallocated<'buf>> {
     /// Uses the ffi `secp256k1_context_preallocated_size` to check the memory size needed for a context.
     pub fn preallocate_size() -> usize { Self::preallocate_size_gen() }
 
-    /// Create a context from a raw context.
+    /// Creates a context from a raw context.
     ///
     /// # Safety
     /// This is highly unsafe, due to the number of conditions that aren't checked.
@@ -364,9 +364,10 @@ impl<'buf> Secp256k1<SignOnlyPreallocated<'buf>> {
     #[inline]
     pub fn preallocate_signing_size() -> usize { Self::preallocate_size_gen() }
 
-    /// Create a context from a raw context.
+    /// Creates a context from a raw context.
     ///
     /// # Safety
+    ///
     /// This is highly unsafe, due to the number of conditions that aren't checked.
     /// * `raw_ctx` needs to be a valid Secp256k1 context pointer.
     /// that was generated by *exactly* the same code/version of the libsecp256k1 used here.
@@ -398,9 +399,10 @@ impl<'buf> Secp256k1<VerifyOnlyPreallocated<'buf>> {
     #[inline]
     pub fn preallocate_verification_size() -> usize { Self::preallocate_size_gen() }
 
-    /// Create a context from a raw context.
+    /// Creates a context from a raw context.
     ///
     /// # Safety
+    ///
     /// This is highly unsafe, due to the number of conditions that aren't checked.
     /// * `raw_ctx` needs to be a valid Secp256k1 context pointer.
     /// that was generated by *exactly* the same code/version of the libsecp256k1 used here.