refactor(migrations): typos in signal migration incompatibility reasons (#58636)

A dot was appearing in the middle of the comment for `DerivedIsIncompatible`.
While at it, a dot was missing in `ClassManuallyInstantiated`.

PR Close #58636

packages/core/schematics/migrations/signal-migration/src/passes/problematic_patterns/incompatibility_human.ts

@@ -50,7 +50,7 @@ export function getMessageForFieldIncompatibility(
           `This ${fieldName.single} is used in combination with \`@HostBinding\` and ` +
           `migrating would break.`,
         extra:
-          `\`@HostBinding\` does not invoke the signal automatically and your code would. ` +
+          `\`@HostBinding\` does not invoke the signal automatically and your code would ` +
           `break after migration. Use \`host\` of \`@Directive\`/\`@Component\`for host bindings.`,
       };
     case FieldIncompatibilityReason.PotentiallyNarrowedInTemplateButNoSupportYet:
@@ -144,7 +144,7 @@ export function getMessageForClassIncompatibility(
       return {
         short:
           `Class of this ${fieldName.single} is manually instantiated. ` +
-          'This is discouraged and prevents migration',
+          'This is discouraged and prevents migration.',
         extra:
           `Signal ${fieldName.plural} require a DI injection context. Manually instantiating ` +
           'breaks this requirement in some cases, so the migration is skipped.',

packages/core/schematics/migrations/signal-migration/test/golden.txt

@@ -827,7 +827,7 @@ import {Component, Input} from '@angular/core';
 export class ManualInstantiation {
   // TODO: Skipped for migration because:
   //  Class of this input is manually instantiated. This is discouraged and prevents
-  //  migration
+  //  migration.
   @Input() bla: string = '';
 }
 @@@@@@ modifier_tests.ts @@@@@@