all: fix docstrings

tests/fuzzers/difficulty/difficulty-fuzz.go

@@ -66,7 +66,7 @@ func (f *fuzzer) readBool() bool {
 	return f.read(1)[0]&0x1 == 0
 }
 
-// The function must return
+// Fuzz function must return
 //
 //   - 1 if the fuzzer should increase priority of the
 //     given input during subsequent fuzzing (for example, the input is lexically

tests/fuzzers/rangeproof/rangeproof-fuzzer.go

@@ -179,6 +179,7 @@ func (f *fuzzer) fuzz() int {
 	return ok
 }
 
+// Fuzz is the fuzzing entryy-point.
 // The function must return
 //
 //   - 1 if the fuzzer should increase priority of the

tests/fuzzers/stacktrie/trie_fuzzer.go

@@ -113,6 +113,7 @@ func (k kvs) Swap(i, j int) {
 	k[j], k[i] = k[i], k[j]
 }
 
+// Fuzz is the fuzzing entry-point.
 // The function must return
 //
 //   - 1 if the fuzzer should increase priority of the

tests/fuzzers/trie/trie-fuzzer.go

@@ -117,6 +117,7 @@ func Generate(input []byte) randTest {
 	return steps
 }
 
+// Fuzz is the fuzzing entry-point.
 // The function must return
 //
 //   - 1 if the fuzzer should increase priority of the

tests/init.go

@@ -232,7 +232,7 @@ var Forks = map[string]*params.ChainConfig{
 	},
 }
 
-// Returns the set of defined fork names
+// AvailableForks returns the set of defined fork names
 func AvailableForks() []string {
 	var availableForks []string
 	for k := range Forks {