Address review comments

Author: odersky

compiler/src/dotty/tools/dotc/transform/ExtensionMethods.scala

@@ -190,7 +190,7 @@ object ExtensionMethods {
         // See the documentation of `memberSignature` to understand why `.stripPoly.ensureMethodic` is needed here.
         candidates filter (c => FullParameterization.memberSignature(c.info) == imeth.info.stripPoly.ensureMethodic.signature)
       assert(matching.nonEmpty,
-       i"""no extension method found for
+       i"""no extension method found for:
           |
           |  $imeth:${imeth.info.show} with signature ${imeth.info.signature} in ${companion.moduleClass}
           |

docs/docs/internals/syntax.md

@@ -1,6 +1,6 @@
 ---
 layout: doc-page
-title: "Scala3 Syntax Summary"
+title: "Scala 3 Syntax Summary"
 ---
 
 The following descriptions of Scala tokens uses literal characters `‘c’` when

docs/docs/reference/syntax.md

@@ -1,6 +1,6 @@
 ---
 layout: doc-page
-title: "Scala3 Syntax Summary"
+title: "Scala 3 Syntax Summary"
 ---
 
 The following descriptions of Scala tokens uses literal characters `‘c’` when

tests/neg/i5773.scala

@@ -23,7 +23,7 @@ object Main {
 21 |    println(1 appendS 2)
    |            ^^^^^^^^^
    |value appendS is not a member of Int.
-   |An extension method was tried, but could not be fully constructed
+   |An extension method was tried, but could not be fully constructed:
    |
    |    Semigroup.sumSemigroup[Any](/* ambiguous */implicitly[Numeric[Any]]).appendS()
 one error found

tests/pos/package-indented.scala

@@ -0,0 +1,8 @@
+
+package p:
+  def f = 10
+
+package q:
+  def g = 20
+
+def Test = p.f + q.g